Question

упростить cosL tgL-sinL

Answer 1

$cos L tg L -sin L=cos L*frac{sin L}{cos L}-sin L=sin L -sin L=0$

ответ: 0

Answer 2

$rm tg L=frac {sin L}{cos L} \ \ cos L cdot tg L-sin L=cos L cdot frac {sin L}{cos L}-sin L=frac {cos L cdot sin L}{cos L} -sin L= \ = sin L - sin L=0$