Question

Упростите

Задания во вложениях

Answer 1

1) cosa/sina+sina/(1+cosa)=(cosa+cos^2a+sin^2a)/sina(1+cosa)=1/sina

2) 3(a-3)*(a+2)(a-2)/(a+2)(a-3)(a+3)=3(a-2)/(a+3)