Question

solve each conditional equstion for x where 0 greater than or equal to x greater than 2pi.

3cos^2 x - sin^2 x =0

Answer 1

3cos^2 x-sin^2 x = 0
3cos^2 x - (1-cos^2 x ) = 0
3cos^2 x -1+cos^2 x =0
cos^2 x = 1/4
cosx = 1/4 or cosx =-1/4