Question

ii. 2cos² theta =1/2​

Answer 1

Answer:

$2 { \cos( theta) }^{2} = \frac{1}{2}$

${ \cos( theta) }^{2} = \frac{1}{4}$

$\cos(theta) = \frac{1}{2}$

But

$\cos(60) = \frac{1}{2}$

therefore

$theta = 60$