Question

1- cos2A/1+sinA=sinA​

Answer 1

$1 - \frac{ {cos}^{2} }{1 + sin} = sin \\ \\ \frac{1 + sin - (1 - {sin}^{2} )}{1 + sin} \\ \\ \frac{sin (1 + sin)}{1 + sin} \\ \\ = sin$