2cosx - cos^2x=sin^2x

Question

2cosx - cos^2x=sin^2x

Answer 1

2cosx - cos^2x=sin^2x

2cosx=sin^2x+cos^2x    ⇔   2cosx=1   ⇔  cosx=1/2  ⇔  

x= ⁻₊ arccos(1/2)+2πn           x= ⁻₊ π/3+2πn