Question

can anybody tell me if they are the same thing, and the examiner wont consider as weong or anything if i do it this way...


is
$\sqrt{1 - { \cos}^{2} \: θ } = (1 - \cos \: θ)$


would they be equally correct?​

Answer 1

no it's false for verification do squaring on the result (1-cosB)²