Cos²3t=1+sin(pi/2-6t)/2

Question

Cos²3t=1+sin(pi/2-6t)/2

Answer 1

Cos²3t=1+sin(pi/2-6t)/2
cos²3t=(1+cos6t)/2
(1+sin(π/2-6t))/2=(1+cos6t)/2
(1+сos6t)/2=(1+cos6t)/2