Question

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

cos2x + 2 cos x + 1 = 0 (3 points)


Options:

A) x = 2π

B) x = π

C) x = pi divided by four. , seven pi divided by four.

D) x = pi divided by two. , three pi divided by two.

Answer 1

your answer will be b