What is the general solution for cos(9x)=-1 ?

The general solution for cos(9x)=-1 is x= pi/9+(2pin)/9

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cos(9x)=-1

cos (9 x) = - 1

x = \frac{π}{9} + \frac{2 πn}{9}

Solution steps

cos (9 x) = - 1

General solutions for

cos (9 x) = - 1

9 x = π + 2 πn

Solve

9 x = π + 2 πn : x = \frac{π}{9} + \frac{2 πn}{9}

x = \frac{π}{9} + \frac{2 πn}{9}

tan^{2} (θ) = 3, 0 \leq θ \leq 2 π

3 sin (x) - 2 cos^{2} (x) = 0

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

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

2 sin (x) - (2 - 2) = 2 csc (x)

What is the general solution for cos(9x)=-1 ?
The general solution for cos(9x)=-1 is x= pi/9+(2pin)/9