Question

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

cos 2x - cos x = 0

Answer 1

is it

1.

\[\cos^2(x) - \cos(x) = 0\]

or

2.

\[co(2x) - \cos(x) = 0\]

Answer 2

2nd one

Answer 3

use a double angle identity

Answer 4

ok
Thank you