Question

equal to one upon two hai to cos square theta ka Maan kya hoga

Answer 1

$\cos(theta) = \frac{1}{2} \: \\ then \: \: { \cos(theta) }^{2} = { \binom{1}{2} }^{2} = \frac{1}{4}$
here, this is yor answer, hope this will help you