Question

If 2 cos 2θ – 1 = 0, find θ​

Answer 1

Answer:

θ=30°

Step-by-step explanation:

2 cos 2θ – 1 = 0

⇒ 2 cos 2θ = 1

⇒ cos 2θ = 1/2

We know that the angle for cos which is 1/2 = 60°

∴2θ = 60°

⇒θ= 30°