Question

Find all solutions to the equation in the interval [0, 2π).

cos x = sin 2x

Answer 1

Is that sin(2x) or sin^2 x?

Answer 2

sin(2x)

Answer 3

replace sin (2x) with 2sin x cos x.

Answer 4

Then get the equation equal to 0, factor out cos x , set each factor equal to 0 and solve each equation.

Answer 5

Which one is it? Please explain more...