Question

Упростить
sina/1+cosa+sina/1-cosa

Answer 1

$frac{sin(a)}{1+cos(a)}+frac{sin(a)}{1-cos(a)}=frac{sin(a)(1-cos(a))+sin(a)(1+cos(a))}{(1+cos(a))(1-cos(a))}=\=frac{2sin(a)}{1-cos^2(a)}=frac{2sin(a)}{sin^2(a)}=frac{2}{sin(a)}$