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Popular >

csc^2(x)+cot^2(x)=3

Solution

csc^{2} (x) + cot^{2} (x) = 3

Solution

x = \frac{π}{4} + 2 πn, x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

+1

Degrees

x = 4 5^{\circ} + 36 0^{\circ} n, x = 13 5^{\circ} + 36 0^{\circ} n, x = 22 5^{\circ} + 36 0^{\circ} n, x = 31 5^{\circ} + 36 0^{\circ} n

Solution steps

csc^{2} (x) + cot^{2} (x) = 3

Subtract

3

from both sides

csc^{2} (x) + cot^{2} (x) - 3 = 0

Rewrite using trig identities

- 3 + cot^{2} (x) + csc^{2} (x)

Use the Pythagorean identity:

1 + cot^{2} (x) = csc^{2} (x)

cot^{2} (x) = csc^{2} (x) - 1

= - 3 + csc^{2} (x) - 1 + csc^{2} (x)

Simplify

- 3 + csc^{2} (x) - 1 + csc^{2} (x) : 2 csc^{2} (x) - 4

- 3 + csc^{2} (x) - 1 + csc^{2} (x)

Group like terms

= csc^{2} (x) + csc^{2} (x) - 3 - 1

Add similar elements:

csc^{2} (x) + csc^{2} (x) = 2 csc^{2} (x)

= 2 csc^{2} (x) - 3 - 1

Subtract the numbers:

- 3 - 1 = - 4

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

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

- 4 + 2 csc^{2} (x) = 0

Solve by substitution

- 4 + 2 csc^{2} (x) = 0

Let:

csc (x) = u

- 4 + 2 u^{2} = 0

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

- 4 + 2 u^{2} = 0

Move

4

to the right side

- 4 + 2 u^{2} = 0

Add

4

to both sides

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

Simplify

2 u^{2} = 4

2 u^{2} = 4

Divide both sides by

2

2 u^{2} = 4

Divide both sides by

2

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

Simplify

u^{2} = 2

u^{2} = 2

For

x^{2} = f (a)

the solutions are

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

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

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

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

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

Combine all the solutions

x = \frac{π}{4} + 2 πn, x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

Popular Examples

csc^2(x)+cot^2(x)=2

csc^{2} (x) + cot^{2} (x) = 2

cos (x) = 0.24

\frac{π}{2} = sin (x)

sec^{4} (x) - 4 = 0

sin^2(θ)-1=0,0<= θ<= 2pi

sin^{2} (θ) - 1 = 0, 0 \leq θ \leq 2 π