Question

Упростить: sin(a+70)-cosa*sin70/sina*cos70

Answer 1

$frac{sin(a+70)-cosacdot sin70}{sinacdot cos70} =frac{sinacdot cos70+cosacdot sin70-cosacdot sin70}{sinacdot cos70} =\\= frac{sinacdot cos70}{sinacdot cos70} =1$

Answer 2

Спасибо :)