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Popular Trigonometry >

sin^4(x/3)+cos^4(x/3)= 5/8

Solution

sin^{4} (\frac{x}{3}) + cos^{4} (\frac{x}{3}) = \frac{5}{8}

Solution

x = \frac{π}{2} + 6 πn, x = \frac{11 π}{2} + 6 πn, x = \frac{5 π}{2} + 6 πn, x = \frac{7 π}{2} + 6 πn, x = π + 6 πn, x = 5 π + 6 πn, x = 2 π + 6 πn, x = 4 π + 6 πn

Degrees

x = 9 0^{\circ} + 108 0^{\circ} n, x = 99 0^{\circ} + 108 0^{\circ} n, x = 45 0^{\circ} + 108 0^{\circ} n, x = 63 0^{\circ} + 108 0^{\circ} n, x = 18 0^{\circ} + 108 0^{\circ} n, x = 90 0^{\circ} + 108 0^{\circ} n, x = 36 0^{\circ} + 108 0^{\circ} n, x = 72 0^{\circ} + 108 0^{\circ} n

Solution steps

sin^{4} (\frac{x}{3}) + cos^{4} (\frac{x}{3}) = \frac{5}{8}

Subtract

\frac{5}{8}

from both sides

sin^{4} (\frac{x}{3}) + cos^{4} (\frac{x}{3}) - \frac{5}{8} = 0

Simplify

sin^{4} (\frac{x}{3}) + cos^{4} (\frac{x}{3}) - \frac{5}{8} : \frac{8 sin ^{4} ( \frac{x}{3} ) + 8 cos ^{4} ( \frac{x}{3} ) - 5}{8}

sin^{4} (\frac{x}{3}) + cos^{4} (\frac{x}{3}) - \frac{5}{8}

Convert element to fraction:

sin^{4} (\frac{x}{3}) = \frac{sin ^{4} ( \frac{x}{3} ) 8}{8}, cos^{4} (\frac{x}{3}) = \frac{cos ^{4} ( \frac{x}{3} ) 8}{8}

= \frac{sin ^{4} ( \frac{x}{3} ) \cdot 8}{8} + \frac{cos ^{4} ( \frac{x}{3} ) \cdot 8}{8} - \frac{5}{8}

Since the denominators are equal, combine the fractions:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{sin ^{4} ( \frac{x}{3} ) \cdot 8 + cos ^{4} ( \frac{x}{3} ) \cdot 8 - 5}{8}

\frac{8 sin ^{4} ( \frac{x}{3} ) + 8 cos ^{4} ( \frac{x}{3} ) - 5}{8} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

8 sin^{4} (\frac{x}{3}) + 8 cos^{4} (\frac{x}{3}) - 5 = 0

Let:

u = \frac{x}{3}

8 sin^{4} (u) + 8 cos^{4} (u) - 5 = 0

Apply exponent rule:

a^{b} = a^{2} a^{b - 2}

- 5 + 8 cos^{4} (u) + 8 sin^{2} (u) sin^{2} (u) = 0

Rewrite using trig identities

- 5 + 8 cos^{4} (u) + 8 sin^{2} (u) sin^{2} (u)

Use the Pythagorean identity:

cos^{2} (x) + sin^{2} (x) = 1

sin^{2} (x) = 1 - cos^{2} (x)

= - 5 + 8 cos^{4} (u) + 8 (1 - cos^{2} (u)) (1 - cos^{2} (u))

Simplify

- 5 + 8 cos^{4} (u) + 8 (1 - cos^{2} (u)) (1 - cos^{2} (u)) : 16 cos^{4} (u) - 16 cos^{2} (u) + 3

- 5 + 8 cos^{4} (u) + 8 (1 - cos^{2} (u)) (1 - cos^{2} (u))

8 (1 - cos^{2} (u)) (1 - cos^{2} (u)) = 8 (1 - cos^{2} (u))^{2}

8 (1 - cos^{2} (u)) (1 - cos^{2} (u))

Apply exponent rule:

a^{b} \cdot a^{c} = a^{b + c}

(1 - cos^{2} (u)) (1 - cos^{2} (u)) = (1 - cos^{2} (u))^{1 + 1}

= 8 (1 - cos^{2} (u))^{1 + 1}

Add the numbers:

1 + 1 = 2

= 8 (1 - cos^{2} (u))^{2}

= - 5 + 8 cos^{4} (u) + 8 (- cos^{2} (u) + 1)^{2}

(1 - cos^{2} (u))^{2} : 1 - 2 cos^{2} (u) + cos^{4} (u)

Apply Perfect Square Formula:

(a - b)^{2} = a^{2} - 2 ab + b^{2}

a = 1, b = cos^{2} (u)

= 1^{2} - 2 \cdot 1 \cdot cos^{2} (u) + (cos^{2} (u))^{2}

Simplify

1^{2} - 2 \cdot 1 \cdot cos^{2} (u) + (cos^{2} (u))^{2} : 1 - 2 cos^{2} (u) + cos^{4} (u)

1^{2} - 2 \cdot 1 \cdot cos^{2} (u) + (cos^{2} (u))^{2}

Apply rule

1^{a} = 1

1^{2} = 1

= 1 - 2 \cdot 1 \cdot cos^{2} (u) + (cos^{2} (u))^{2}

2 \cdot 1 \cdot cos^{2} (u) = 2 cos^{2} (u)

2 \cdot 1 \cdot cos^{2} (u)

Multiply the numbers:

2 \cdot 1 = 2

= 2 cos^{2} (u)

(cos^{2} (u))^{2} = cos^{4} (u)

(cos^{2} (u))^{2}

Apply exponent rule:

(a^{b})^{c} = a^{b c}

= cos^{2 \cdot 2} (u)

Multiply the numbers:

2 \cdot 2 = 4

= cos^{4} (u)

= 1 - 2 cos^{2} (u) + cos^{4} (u)

= 1 - 2 cos^{2} (u) + cos^{4} (u)

= - 5 + 8 cos^{4} (u) + 8 (1 - 2 cos^{2} (u) + cos^{4} (u))

Expand

8 (1 - 2 cos^{2} (u) + cos^{4} (u)) : 8 - 16 cos^{2} (u) + 8 cos^{4} (u)

8 (1 - 2 cos^{2} (u) + cos^{4} (u))

Distribute parentheses

= 8 \cdot 1 + 8 (- 2 cos^{2} (u)) + 8 cos^{4} (u)

Apply minus-plus rules

+ (- a) = - a

= 8 \cdot 1 - 8 \cdot 2 cos^{2} (u) + 8 cos^{4} (u)

Simplify

8 \cdot 1 - 8 \cdot 2 cos^{2} (u) + 8 cos^{4} (u) : 8 - 16 cos^{2} (u) + 8 cos^{4} (u)

8 \cdot 1 - 8 \cdot 2 cos^{2} (u) + 8 cos^{4} (u)

Multiply the numbers:

8 \cdot 1 = 8

= 8 - 8 \cdot 2 cos^{2} (u) + 8 cos^{4} (u)

Multiply the numbers:

8 \cdot 2 = 16

= 8 - 16 cos^{2} (u) + 8 cos^{4} (u)

= 8 - 16 cos^{2} (u) + 8 cos^{4} (u)

= - 5 + 8 cos^{4} (u) + 8 - 16 cos^{2} (u) + 8 cos^{4} (u)

Simplify

- 5 + 8 cos^{4} (u) + 8 - 16 cos^{2} (u) + 8 cos^{4} (u) : 16 cos^{4} (u) - 16 cos^{2} (u) + 3

- 5 + 8 cos^{4} (u) + 8 - 16 cos^{2} (u) + 8 cos^{4} (u)

Group like terms

= 8 cos^{4} (u) - 16 cos^{2} (u) + 8 cos^{4} (u) - 5 + 8

Add similar elements:

8 cos^{4} (u) + 8 cos^{4} (u) = 16 cos^{4} (u)

= 16 cos^{4} (u) - 16 cos^{2} (u) - 5 + 8

Add/Subtract the numbers:

- 5 + 8 = 3

= 16 cos^{4} (u) - 16 cos^{2} (u) + 3

= 16 cos^{4} (u) - 16 cos^{2} (u) + 3

= 16 cos^{4} (u) - 16 cos^{2} (u) + 3

3 - 16 cos^{2} (u) + 16 cos^{4} (u) = 0

Solve by substitution

3 - 16 cos^{2} (u) + 16 cos^{4} (u) = 0

Let:

cos (u) = u

3 - 16 u^{2} + 16 u^{4} = 0

3 - 16 u^{2} + 16 u^{4} = 0 : u = \frac{3}{2}, u = - \frac{3}{2}, u = \frac{1}{2}, u = - \frac{1}{2}

3 - 16 u^{2} + 16 u^{4} = 0

Write in the standard form

a_{n} x^{n} + \dots + a_{1} x + a_{0} = 0

16 u^{4} - 16 u^{2} + 3 = 0

Rewrite the equation with

v = u^{2}

and

v^{2} = u^{4}

16 v^{2} - 16 v + 3 = 0

Solve

16 v^{2} - 16 v + 3 = 0 : v = \frac{3}{4}, v = \frac{1}{4}

16 v^{2} - 16 v + 3 = 0

Solve with the quadratic formula

16 v^{2} - 16 v + 3 = 0

Quadratic Equation Formula:

For

a = 16, b = - 16, c = 3

v_{1, 2} = \frac{- ( - 16 ) \pm ( - 16 ) ^{2} - 4 \cdot 16 \cdot 3}{2 \cdot 16}

v_{1, 2} = \frac{- ( - 16 ) \pm ( - 16 ) ^{2} - 4 \cdot 16 \cdot 3}{2 \cdot 16}

(- 16)^{2} - 4 \cdot 16 \cdot 3 = 8

(- 16)^{2} - 4 \cdot 16 \cdot 3

Apply exponent rule:

(- a)^{n} = a^{n},

n

is even

(- 16)^{2} = 1 6^{2}

= 1 6^{2} - 4 \cdot 16 \cdot 3

Multiply the numbers:

4 \cdot 16 \cdot 3 = 192

= 1 6^{2} - 192

1 6^{2} = 256

= 256 - 192

Subtract the numbers:

256 - 192 = 64

= 64

Factor the number:

64 = 8^{2}

= 8^{2}

Apply radical rule:

8^{2} = 8

= 8

v_{1, 2} = \frac{- ( - 16 ) \pm 8}{2 \cdot 16}

Separate the solutions

v_{1} = \frac{- ( - 16 ) + 8}{2 \cdot 16}, v_{2} = \frac{- ( - 16 ) - 8}{2 \cdot 16}

v = \frac{- ( - 16 ) + 8}{2 \cdot 16} : \frac{3}{4}

\frac{- ( - 16 ) + 8}{2 \cdot 16}

Apply rule

- (- a) = a

= \frac{16 + 8}{2 \cdot 16}

Add the numbers:

16 + 8 = 24

= \frac{24}{2 \cdot 16}

Multiply the numbers:

2 \cdot 16 = 32

= \frac{24}{32}

Cancel the common factor:

8

= \frac{3}{4}

v = \frac{- ( - 16 ) - 8}{2 \cdot 16} : \frac{1}{4}

\frac{- ( - 16 ) - 8}{2 \cdot 16}

Apply rule

- (- a) = a

= \frac{16 - 8}{2 \cdot 16}

Subtract the numbers:

16 - 8 = 8

= \frac{8}{2 \cdot 16}

Multiply the numbers:

2 \cdot 16 = 32

= \frac{8}{32}

Cancel the common factor:

8

= \frac{1}{4}

The solutions to the quadratic equation are:

v = \frac{3}{4}, v = \frac{1}{4}

v = \frac{3}{4}, v = \frac{1}{4}

Substitute back

v = u^{2},

solve for

u

Solve

u^{2} = \frac{3}{4} : u = \frac{3}{2}, u = - \frac{3}{2}

u^{2} = \frac{3}{4}

For

x^{2} = f (a)

the solutions are

x = f (a), - f (a)

u = \frac{3}{4}, u = - \frac{3}{4}

\frac{3}{4} = \frac{3}{2}

\frac{3}{4}

Apply radical rule:

assuming

a \geq 0, b \geq 0

= \frac{3}{4}

4 = 2

4

Factor the number:

4 = 2^{2}

= 2^{2}

Apply radical rule:

2^{2} = 2

= 2

= \frac{3}{2}

- \frac{3}{4} = - \frac{3}{2}

- \frac{3}{4}

Simplify

\frac{3}{4} : \frac{3}{2}

\frac{3}{4}

Apply radical rule:

assuming

a \geq 0, b \geq 0

= \frac{3}{4}

4 = 2

4

Factor the number:

4 = 2^{2}

= 2^{2}

Apply radical rule:

2^{2} = 2

= 2

= \frac{3}{2}

= - \frac{3}{2}

u = \frac{3}{2}, u = - \frac{3}{2}

Solve

u^{2} = \frac{1}{4} : u = \frac{1}{2}, u = - \frac{1}{2}

u^{2} = \frac{1}{4}

For

x^{2} = f (a)

the solutions are

x = f (a), - f (a)

u = \frac{1}{4}, u = - \frac{1}{4}

\frac{1}{4} = \frac{1}{2}

\frac{1}{4}

Apply radical rule:

assuming

a \geq 0, b \geq 0

= \frac{1}{4}

4 = 2

4

Factor the number:

4 = 2^{2}

= 2^{2}

Apply radical rule:

2^{2} = 2

= 2

= \frac{1}{2}

Apply rule

1 = 1

= \frac{1}{2}

- \frac{1}{4} = - \frac{1}{2}

- \frac{1}{4}

Simplify

\frac{1}{4} : \frac{1}{2}

\frac{1}{4}

Apply radical rule:

assuming

a \geq 0, b \geq 0

= \frac{1}{4}

4 = 2

4

Factor the number:

4 = 2^{2}

= 2^{2}

Apply radical rule:

2^{2} = 2

= 2

= \frac{1}{2}

= - \frac{1}{2}

Apply rule

1 = 1

= - \frac{1}{2}

u = \frac{1}{2}, u = - \frac{1}{2}

The solutions are

u = \frac{3}{2}, u = - \frac{3}{2}, u = \frac{1}{2}, u = - \frac{1}{2}

Substitute back

u = cos (u)

cos (u) = \frac{3}{2}, cos (u) = - \frac{3}{2}, cos (u) = \frac{1}{2}, cos (u) = - \frac{1}{2}

cos (u) = \frac{3}{2}, cos (u) = - \frac{3}{2}, cos (u) = \frac{1}{2}, cos (u) = - \frac{1}{2}

cos (u) = \frac{3}{2} : u = \frac{π}{6} + 2 πn, u = \frac{11 π}{6} + 2 πn

cos (u) = \frac{3}{2}

General solutions for

cos (u) = \frac{3}{2}

cos (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

u = \frac{π}{6} + 2 πn, u = \frac{11 π}{6} + 2 πn

u = \frac{π}{6} + 2 πn, u = \frac{11 π}{6} + 2 πn

cos (u) = - \frac{3}{2} : u = \frac{5 π}{6} + 2 πn, u = \frac{7 π}{6} + 2 πn

cos (u) = - \frac{3}{2}

General solutions for

cos (u) = - \frac{3}{2}

cos (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

u = \frac{5 π}{6} + 2 πn, u = \frac{7 π}{6} + 2 πn

u = \frac{5 π}{6} + 2 πn, u = \frac{7 π}{6} + 2 πn

cos (u) = \frac{1}{2} : u = \frac{π}{3} + 2 πn, u = \frac{5 π}{3} + 2 πn

cos (u) = \frac{1}{2}

General solutions for

cos (u) = \frac{1}{2}

cos (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

u = \frac{π}{3} + 2 πn, u = \frac{5 π}{3} + 2 πn

u = \frac{π}{3} + 2 πn, u = \frac{5 π}{3} + 2 πn

cos (u) = - \frac{1}{2} : u = \frac{2 π}{3} + 2 πn, u = \frac{4 π}{3} + 2 πn

cos (u) = - \frac{1}{2}

General solutions for

cos (u) = - \frac{1}{2}

cos (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

u = \frac{2 π}{3} + 2 πn, u = \frac{4 π}{3} + 2 πn

u = \frac{2 π}{3} + 2 πn, u = \frac{4 π}{3} + 2 πn

Combine all the solutions

u = \frac{π}{6} + 2 πn, u = \frac{11 π}{6} + 2 πn, u = \frac{5 π}{6} + 2 πn, u = \frac{7 π}{6} + 2 πn, u = \frac{π}{3} + 2 πn, u = \frac{5 π}{3} + 2 πn, u = \frac{2 π}{3} + 2 πn, u = \frac{4 π}{3} + 2 πn

Substitute back

u = \frac{x}{3}

\frac{x}{3} = \frac{π}{6} + 2 πn : x = \frac{π}{2} + 6 πn

\frac{x}{3} = \frac{π}{6} + 2 πn

Multiply both sides by

3

\frac{x}{3} = \frac{π}{6} + 2 πn

Multiply both sides by

3

\frac{3 x}{3} = 3 \cdot \frac{π}{6} + 3 \cdot 2 πn

Simplify

\frac{3 x}{3} = 3 \cdot \frac{π}{6} + 3 \cdot 2 πn

Simplify

\frac{3 x}{3} : x

\frac{3 x}{3}

Divide the numbers:

\frac{3}{3} = 1

= x

Simplify

3 \cdot \frac{π}{6} + 3 \cdot 2 πn : \frac{π}{2} + 6 πn

3 \cdot \frac{π}{6} + 3 \cdot 2 πn

3 \cdot \frac{π}{6} = \frac{π}{2}

3 \cdot \frac{π}{6}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{π 3}{6}

Cancel the common factor:

3

= \frac{π}{2}

3 \cdot 2 πn = 6 πn

3 \cdot 2 πn

Multiply the numbers:

3 \cdot 2 = 6

= 6 πn

= \frac{π}{2} + 6 πn

x = \frac{π}{2} + 6 πn

x = \frac{π}{2} + 6 πn

x = \frac{π}{2} + 6 πn

\frac{x}{3} = \frac{11 π}{6} + 2 πn : x = \frac{11 π}{2} + 6 πn

\frac{x}{3} = \frac{11 π}{6} + 2 πn

Multiply both sides by

3

\frac{x}{3} = \frac{11 π}{6} + 2 πn

Multiply both sides by

3

\frac{3 x}{3} = 3 \cdot \frac{11 π}{6} + 3 \cdot 2 πn

Simplify

\frac{3 x}{3} = 3 \cdot \frac{11 π}{6} + 3 \cdot 2 πn

Simplify

\frac{3 x}{3} : x

\frac{3 x}{3}

Divide the numbers:

\frac{3}{3} = 1

= x

Simplify

3 \cdot \frac{11 π}{6} + 3 \cdot 2 πn : \frac{11 π}{2} + 6 πn

3 \cdot \frac{11 π}{6} + 3 \cdot 2 πn

3 \cdot \frac{11 π}{6} = \frac{11 π}{2}

3 \cdot \frac{11 π}{6}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{11 π 3}{6}

Multiply the numbers:

11 \cdot 3 = 33

= \frac{33 π}{6}

Cancel the common factor:

3

= \frac{11 π}{2}

3 \cdot 2 πn = 6 πn

3 \cdot 2 πn

Multiply the numbers:

3 \cdot 2 = 6

= 6 πn

= \frac{11 π}{2} + 6 πn

x = \frac{11 π}{2} + 6 πn

x = \frac{11 π}{2} + 6 πn

x = \frac{11 π}{2} + 6 πn

\frac{x}{3} = \frac{5 π}{6} + 2 πn : x = \frac{5 π}{2} + 6 πn

\frac{x}{3} = \frac{5 π}{6} + 2 πn

Multiply both sides by

3

\frac{x}{3} = \frac{5 π}{6} + 2 πn

Multiply both sides by

3

\frac{3 x}{3} = 3 \cdot \frac{5 π}{6} + 3 \cdot 2 πn

Simplify

\frac{3 x}{3} = 3 \cdot \frac{5 π}{6} + 3 \cdot 2 πn

Simplify

\frac{3 x}{3} : x

\frac{3 x}{3}

Divide the numbers:

\frac{3}{3} = 1

= x

Simplify

3 \cdot \frac{5 π}{6} + 3 \cdot 2 πn : \frac{5 π}{2} + 6 πn

3 \cdot \frac{5 π}{6} + 3 \cdot 2 πn

3 \cdot \frac{5 π}{6} = \frac{5 π}{2}

3 \cdot \frac{5 π}{6}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{5 π 3}{6}

Multiply the numbers:

5 \cdot 3 = 15

= \frac{15 π}{6}

Cancel the common factor:

3

= \frac{5 π}{2}

3 \cdot 2 πn = 6 πn

3 \cdot 2 πn

Multiply the numbers:

3 \cdot 2 = 6

= 6 πn

= \frac{5 π}{2} + 6 πn

x = \frac{5 π}{2} + 6 πn

x = \frac{5 π}{2} + 6 πn

x = \frac{5 π}{2} + 6 πn

\frac{x}{3} = \frac{7 π}{6} + 2 πn : x = \frac{7 π}{2} + 6 πn

\frac{x}{3} = \frac{7 π}{6} + 2 πn

Multiply both sides by

3

\frac{x}{3} = \frac{7 π}{6} + 2 πn

Multiply both sides by

3

\frac{3 x}{3} = 3 \cdot \frac{7 π}{6} + 3 \cdot 2 πn

Simplify

\frac{3 x}{3} = 3 \cdot \frac{7 π}{6} + 3 \cdot 2 πn

Simplify

\frac{3 x}{3} : x

\frac{3 x}{3}

Divide the numbers:

\frac{3}{3} = 1

= x

Simplify

3 \cdot \frac{7 π}{6} + 3 \cdot 2 πn : \frac{7 π}{2} + 6 πn

3 \cdot \frac{7 π}{6} + 3 \cdot 2 πn

3 \cdot \frac{7 π}{6} = \frac{7 π}{2}

3 \cdot \frac{7 π}{6}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{7 π 3}{6}

Multiply the numbers:

7 \cdot 3 = 21

= \frac{21 π}{6}

Cancel the common factor:

3

= \frac{7 π}{2}

3 \cdot 2 πn = 6 πn

3 \cdot 2 πn

Multiply the numbers:

3 \cdot 2 = 6

= 6 πn

= \frac{7 π}{2} + 6 πn

x = \frac{7 π}{2} + 6 πn

x = \frac{7 π}{2} + 6 πn

x = \frac{7 π}{2} + 6 πn

\frac{x}{3} = \frac{π}{3} + 2 πn : x = π + 6 πn

\frac{x}{3} = \frac{π}{3} + 2 πn

Multiply both sides by

3

\frac{x}{3} = \frac{π}{3} + 2 πn

Multiply both sides by

3

\frac{3 x}{3} = 3 \cdot \frac{π}{3} + 3 \cdot 2 πn

Simplify

\frac{3 x}{3} = 3 \cdot \frac{π}{3} + 3 \cdot 2 πn

Simplify

\frac{3 x}{3} : x

\frac{3 x}{3}

Divide the numbers:

\frac{3}{3} = 1

= x

Simplify

3 \cdot \frac{π}{3} + 3 \cdot 2 πn : π + 6 πn

3 \cdot \frac{π}{3} + 3 \cdot 2 πn

3 \cdot \frac{π}{3} = π

3 \cdot \frac{π}{3}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{π 3}{3}

Cancel the common factor:

3

= π

3 \cdot 2 πn = 6 πn

3 \cdot 2 πn

Multiply the numbers:

3 \cdot 2 = 6

= 6 πn

= π + 6 πn

x = π + 6 πn

x = π + 6 πn

x = π + 6 πn

\frac{x}{3} = \frac{5 π}{3} + 2 πn : x = 5 π + 6 πn

\frac{x}{3} = \frac{5 π}{3} + 2 πn

Multiply both sides by

3

\frac{x}{3} = \frac{5 π}{3} + 2 πn

Multiply both sides by

3

\frac{3 x}{3} = 3 \cdot \frac{5 π}{3} + 3 \cdot 2 πn

Simplify

\frac{3 x}{3} = 3 \cdot \frac{5 π}{3} + 3 \cdot 2 πn

Simplify

\frac{3 x}{3} : x

\frac{3 x}{3}

Divide the numbers:

\frac{3}{3} = 1

= x

Simplify

3 \cdot \frac{5 π}{3} + 3 \cdot 2 πn : 5 π + 6 πn

3 \cdot \frac{5 π}{3} + 3 \cdot 2 πn

3 \cdot \frac{5 π}{3} = 5 π

3 \cdot \frac{5 π}{3}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{5 π 3}{3}

Cancel the common factor:

3

= 5 π

3 \cdot 2 πn = 6 πn

3 \cdot 2 πn

Multiply the numbers:

3 \cdot 2 = 6

= 6 πn

= 5 π + 6 πn

x = 5 π + 6 πn

x = 5 π + 6 πn

x = 5 π + 6 πn

\frac{x}{3} = \frac{2 π}{3} + 2 πn : x = 2 π + 6 πn

\frac{x}{3} = \frac{2 π}{3} + 2 πn

Multiply both sides by

3

\frac{x}{3} = \frac{2 π}{3} + 2 πn

Multiply both sides by

3

\frac{3 x}{3} = 3 \cdot \frac{2 π}{3} + 3 \cdot 2 πn

Simplify

\frac{3 x}{3} = 3 \cdot \frac{2 π}{3} + 3 \cdot 2 πn

Simplify

\frac{3 x}{3} : x

\frac{3 x}{3}

Divide the numbers:

\frac{3}{3} = 1

= x

Simplify

3 \cdot \frac{2 π}{3} + 3 \cdot 2 πn : 2 π + 6 πn

3 \cdot \frac{2 π}{3} + 3 \cdot 2 πn

3 \cdot \frac{2 π}{3} = 2 π

3 \cdot \frac{2 π}{3}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{2 π 3}{3}

Cancel the common factor:

3

= 2 π

3 \cdot 2 πn = 6 πn

3 \cdot 2 πn

Multiply the numbers:

3 \cdot 2 = 6

= 6 πn

= 2 π + 6 πn

x = 2 π + 6 πn

x = 2 π + 6 πn

x = 2 π + 6 πn

\frac{x}{3} = \frac{4 π}{3} + 2 πn : x = 4 π + 6 πn

\frac{x}{3} = \frac{4 π}{3} + 2 πn

Multiply both sides by

3

\frac{x}{3} = \frac{4 π}{3} + 2 πn

Multiply both sides by

3

\frac{3 x}{3} = 3 \cdot \frac{4 π}{3} + 3 \cdot 2 πn

Simplify

\frac{3 x}{3} = 3 \cdot \frac{4 π}{3} + 3 \cdot 2 πn

Simplify

\frac{3 x}{3} : x

\frac{3 x}{3}

Divide the numbers:

\frac{3}{3} = 1

= x

Simplify

3 \cdot \frac{4 π}{3} + 3 \cdot 2 πn : 4 π + 6 πn

3 \cdot \frac{4 π}{3} + 3 \cdot 2 πn

3 \cdot \frac{4 π}{3} = 4 π

3 \cdot \frac{4 π}{3}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{4 π 3}{3}

Cancel the common factor:

3

= 4 π

3 \cdot 2 πn = 6 πn

3 \cdot 2 πn

Multiply the numbers:

3 \cdot 2 = 6

= 6 πn

= 4 π + 6 πn

x = 4 π + 6 πn

x = 4 π + 6 πn

x = 4 π + 6 πn

x = \frac{π}{2} + 6 πn, x = \frac{11 π}{2} + 6 πn, x = \frac{5 π}{2} + 6 πn, x = \frac{7 π}{2} + 6 πn, x = π + 6 πn, x = 5 π + 6 πn, x = 2 π + 6 πn, x = 4 π + 6 πn

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