Question

Нужно сократить, помогите пож-ста

Answer 1

1) $frac{Sin ^{2} alpha }{1+Cos alpha }= frac{1-Cos ^{2} alpha }{1+Cos alpha } = frac{(1+Cos alpha )(1-Cos alpha )}{1+Cos alpha } =1 -Cos alpha$
2) $frac{Cos ^{2} alpha }{1-Sin alpha }= frac{1-Sin ^{2} alpha }{1-Sin alpha }= frac{(1-Sin alpha )(1+Sin alpha )}{1-Sin alpha } =1 +Sin alpha$