Question

упростите выражение (срочно)​

Answer 1

$1)\frac{2Sin\alpha Cos\alpha}{1-Sin^{2}\alpha} =\frac{2Sin\alpha Cos\alpha}{Cos^{2}\alpha}=\frac{2Sin\alpha }{Cos\alpha}=2tg\alpha\\\\2)Sin^{2}\alpha+Cos^{2}\alpha+Ctg^{2}\alpha=1+Ctg^{2}\alpha=\frac{1}{Sin^{2}\alpha}$