Question

Помогите пожалуйста разобраться!!!

Answer 1

$frac{2+3Sin ^{2} alpha }{5-3Cos ^{2} alpha }-Sin ^{2} alpha = frac{2Sin ^{2} alpha +2Cos ^{2} alpha +3Sin ^{2} alpha }{5Sin ^{2} alpha +5Cos ^{2} alpha -3Cos ^{2} alpha }-Sin ^{2} alpha = frac{5Sin ^{2} alpha +2Cos ^{2} alpha }{5Sin ^{2} alpha +2Cos ^{2} alpha }$$-Sin ^{2} alpha =1-Sin ^{2} alpha =Cos ^{2} alpha$