Question

how is
$\cos \: square( \theta \: by \: 2) = cos \: theta$

Answer 1

Hey dear here is your answer!!!!!

This is because when we take out square root of any angle it remain same ...

For eg. √sin^2 45°
=>sin45°

Therefore √cos^2 theta/2 is written as cos theta / 2

Hope it helps u dear....