English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular Trigonometry >

(csc^2(x))/4 =4sin^2(x)

Solution

\frac{csc ^{2} ( x )}{4} = 4 sin^{2} (x)

Solution

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

Degrees

x = 3 0^{\circ} + 36 0^{\circ} n, x = 15 0^{\circ} + 36 0^{\circ} n, x = 21 0^{\circ} + 36 0^{\circ} n, x = 33 0^{\circ} + 36 0^{\circ} n

Solution steps

\frac{csc ^{2} ( x )}{4} = 4 sin^{2} (x)

Subtract

4 sin^{2} (x)

from both sides

\frac{csc ^{2} ( x )}{4} - 4 sin^{2} (x) = 0

Simplify

\frac{csc ^{2} ( x )}{4} - 4 sin^{2} (x) : \frac{csc ^{2} ( x ) - 16 sin ^{2} ( x )}{4}

\frac{csc ^{2} ( x )}{4} - 4 sin^{2} (x)

Convert element to fraction:

4 sin^{2} (x) = \frac{4 sin ^{2} ( x ) 4}{4}

= \frac{csc ^{2} ( x )}{4} - \frac{4 sin ^{2} ( x ) \cdot 4}{4}

Since the denominators are equal, combine the fractions:

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

= \frac{csc ^{2} ( x ) - 4 sin ^{2} ( x ) \cdot 4}{4}

Multiply the numbers:

4 \cdot 4 = 16

= \frac{csc ^{2} ( x ) - 16 sin ^{2} ( x )}{4}

\frac{csc ^{2} ( x ) - 16 sin ^{2} ( x )}{4} = 0

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

csc^{2} (x) - 16 sin^{2} (x) = 0

Factor

csc^{2} (x) - 16 sin^{2} (x) : (csc (x) + 4 sin (x)) (csc (x) - 4 sin (x))

csc^{2} (x) - 16 sin^{2} (x)

Rewrite

csc^{2} (x) - 16 sin^{2} (x)

csc^{2} (x) - (4 sin (x))^{2}

csc^{2} (x) - 16 sin^{2} (x)

Rewrite

16

4^{2}

= csc^{2} (x) - 4^{2} sin^{2} (x)

Apply exponent rule:

a^{m} b^{m} = (ab)^{m}

4^{2} sin^{2} (x) = (4 sin (x))^{2}

= csc^{2} (x) - (4 sin (x))^{2}

= csc^{2} (x) - (4 sin (x))^{2}

Apply Difference of Two Squares Formula:

x^{2} - y^{2} = (x + y) (x - y)

csc^{2} (x) - (4 sin (x))^{2} = (csc (x) + 4 sin (x)) (csc (x) - 4 sin (x))

= (csc (x) + 4 sin (x)) (csc (x) - 4 sin (x))

(csc (x) + 4 sin (x)) (csc (x) - 4 sin (x)) = 0

Solving each part separately

csc (x) + 4 sin (x) = 0 or csc (x) - 4 sin (x) = 0

csc (x) + 4 sin (x) = 0 :

No Solution

csc (x) + 4 sin (x) = 0

Rewrite using trig identities

csc (x) + 4 sin (x)

Use the basic trigonometric identity:

sin (x) = \frac{1}{csc ( x )}

= csc (x) + 4 \cdot \frac{1}{csc ( x )}

4 \cdot \frac{1}{csc ( x )} = \frac{4}{csc ( x )}

4 \cdot \frac{1}{csc ( x )}

Multiply fractions:

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

= \frac{1 \cdot 4}{csc ( x )}

Multiply the numbers:

1 \cdot 4 = 4

= \frac{4}{csc ( x )}

= csc (x) + \frac{4}{csc ( x )}

csc (x) + \frac{4}{csc ( x )} = 0

Solve by substitution

csc (x) + \frac{4}{csc ( x )} = 0

Let:

csc (x) = u

u + \frac{4}{u} = 0

u + \frac{4}{u} = 0 : u = 2 i, u = - 2 i

u + \frac{4}{u} = 0

Multiply both sides by

u

u + \frac{4}{u} = 0

Multiply both sides by

u

uu + \frac{4}{u} u = 0 \cdot u

Simplify

uu + \frac{4}{u} u = 0 \cdot u

Simplify

uu : u^{2}

uu

Apply exponent rule:

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

uu = u^{1 + 1}

= u^{1 + 1}

Add the numbers:

1 + 1 = 2

= u^{2}

Simplify

\frac{4}{u} u : 4

\frac{4}{u} u

Multiply fractions:

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

= \frac{4 u}{u}

Cancel the common factor:

u

= 4

Simplify

0 \cdot u : 0

0 \cdot u

Apply rule

0 \cdot a = 0

= 0

u^{2} + 4 = 0

u^{2} + 4 = 0

u^{2} + 4 = 0

Solve

u^{2} + 4 = 0 : u = 2 i, u = - 2 i

u^{2} + 4 = 0

Move

4

to the right side

u^{2} + 4 = 0

Subtract

4

from both sides

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

Simplify

u^{2} = - 4

u^{2} = - 4

For

x^{2} = f (a)

the solutions are

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

u = - 4, u = - - 4

Simplify

- 4 : 2 i

- 4

Apply radical rule:

- a = - 1 a

- 4 = - 1 4

= - 1 4

Apply imaginary number rule:

- 1 = i

= 4 i

4 = 2

4

Factor the number:

4 = 2^{2}

= 2^{2}

Apply radical rule:

2^{2} = 2

= 2

= 2 i

Simplify

- - 4 : - 2 i

- - 4

Simplify

- 4 : 2 i

- 4

Apply radical rule:

- a = - 1 a

- 4 = - 1 4

= - 1 4

Apply imaginary number rule:

- 1 = i

= 4 i

4 = 2

4

Factor the number:

4 = 2^{2}

= 2^{2}

Apply radical rule:

2^{2} = 2

= 2

= 2 i

= - 2 i

u = 2 i, u = - 2 i

u = 2 i, u = - 2 i

Substitute back

u = csc (x)

csc (x) = 2 i, csc (x) = - 2 i

csc (x) = 2 i, csc (x) = - 2 i

csc (x) = 2 i :

No Solution

csc (x) = 2 i

No Solution

csc (x) = - 2 i :

No Solution

csc (x) = - 2 i

No Solution

Combine all the solutions

No Solution

csc (x) - 4 sin (x) = 0 : x = \frac{π}{6} + 2 πn, x = \frac{5 π}{6} + 2 πn, x = \frac{7 π}{6} + 2 πn, x = \frac{11 π}{6} + 2 πn

csc (x) - 4 sin (x) = 0

Rewrite using trig identities

csc (x) - 4 sin (x)

Use the basic trigonometric identity:

sin (x) = \frac{1}{csc ( x )}

= csc (x) - 4 \cdot \frac{1}{csc ( x )}

4 \cdot \frac{1}{csc ( x )} = \frac{4}{csc ( x )}

4 \cdot \frac{1}{csc ( x )}

Multiply fractions:

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

= \frac{1 \cdot 4}{csc ( x )}

Multiply the numbers:

1 \cdot 4 = 4

= \frac{4}{csc ( x )}

= csc (x) - \frac{4}{csc ( x )}

csc (x) - \frac{4}{csc ( x )} = 0

Solve by substitution

csc (x) - \frac{4}{csc ( x )} = 0

Let:

csc (x) = u

u - \frac{4}{u} = 0

u - \frac{4}{u} = 0 : u = 2, u = - 2

u - \frac{4}{u} = 0

Multiply both sides by

u

u - \frac{4}{u} = 0

Multiply both sides by

u

uu - \frac{4}{u} u = 0 \cdot u

Simplify

uu - \frac{4}{u} u = 0 \cdot u

Simplify

uu : u^{2}

uu

Apply exponent rule:

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

uu = u^{1 + 1}

= u^{1 + 1}

Add the numbers:

1 + 1 = 2

= u^{2}

Simplify

- \frac{4}{u} u : - 4

- \frac{4}{u} u

Multiply fractions:

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

= - \frac{4 u}{u}

Cancel the common factor:

u

= - 4

Simplify

0 \cdot u : 0

0 \cdot u

Apply rule

0 \cdot a = 0

= 0

u^{2} - 4 = 0

u^{2} - 4 = 0

u^{2} - 4 = 0

Solve

u^{2} - 4 = 0 : u = 2, u = - 2

u^{2} - 4 = 0

Move

4

to the right side

u^{2} - 4 = 0

Add

4

to both sides

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

Simplify

u^{2} = 4

u^{2} = 4

For

x^{2} = f (a)

the solutions are

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

u = 4, u = - 4

4 = 2

4

Factor the number:

4 = 2^{2}

= 2^{2}

Apply radical rule:

2^{2} = 2

= 2

- 4 = - 2

- 4

4 = 2

4

Factor the number:

4 = 2^{2}

= 2^{2}

Apply radical rule:

2^{2} = 2

= 2

= - 2

u = 2, u = - 2

u = 2, u = - 2

Verify Solutions

Find undefined (singularity) points:

u = 0

Take the denominator(s) of

u - \frac{4}{u}

and compare to zero

u = 0

The following points are undefined

u = 0

Combine undefined points with solutions:

u = 2, u = - 2

Substitute back

u = csc (x)

csc (x) = 2, csc (x) = - 2

csc (x) = 2, csc (x) = - 2

csc (x) = 2 : x = \frac{π}{6} + 2 πn, x = \frac{5 π}{6} + 2 πn

csc (x) = 2

General solutions for

csc (x) = 2

csc (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} csc (x) Undefiend 22 \frac{2 3}{3} 1 \frac{2 3}{3} 22 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} csc (x) Undefiend - 2 - 2 - \frac{2 3}{3} - 1 - \frac{2 3}{3} - 2 - 2

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

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

csc (x) = - 2 : x = \frac{7 π}{6} + 2 πn, x = \frac{11 π}{6} + 2 πn

csc (x) = - 2

General solutions for

csc (x) = - 2

csc (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} csc (x) Undefiend 22 \frac{2 3}{3} 1 \frac{2 3}{3} 22 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} csc (x) Undefiend - 2 - 2 - \frac{2 3}{3} - 1 - \frac{2 3}{3} - 2 - 2

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

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

Combine all the solutions

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

Combine all the solutions

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

Graph

Popular Examples

6sec^2(x)-3cos(x)-10=sec(x)

tan(x)-sec(x)=sqrt(3)

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

4tan(3x)=-4

cos(pi/3-x)=1