Question

Sin 2alfa by 1+cos2alfa

Answer 1

Hey, mate here is ur answer!
$\sin(2 \alpha ) = 2 \sin( \alpha ) \cos( \alpha ) \\ \cos(2 \alpha ) = 2 \cos {}^{2} ( \alpha ) - 1 \\ = > 2 \sin( \alpha ) \cos( \alpha ) \div (1 + 2 \cos {}^{2} ( \alpha ) - 1) \\ = \tan( \alpha )$