Question

Number of values of x in [0, pi] satisfying the equation 2cos^2x = 1 - cos 3x is equal to
<br />(A) 2
<br />(B) 3
<br />(C) 4
<br />(D) 5​

Answer 1

Answer:

your answer will be (b) 3

because cos 3x is equal to 3 only