Question

Which value of theta satisfies the equation 2cos^2theta - cos theta=0

A) cos2(θ)−cos(θ)=0

B) cos(θ)(cos(θ)−1)=0

C) cos(θ)=0

D) cos(θ)=1

Answer 1

2cos^2(θ) - cos(θ) = 0
cos(θ) (2cos(θ) - 1) = 0
cos(θ) = 0

option C is the correct answer.