Question

Доказать тождество
$frac{sin 3L}{sin L}- frac{cos 3L}{cos L}=2$

Answer 1

(sin3αcosα-cos3αsinα)/sinαcosα=sin(3α-α)/sinαcosα=sin 2α/sinαcosα=2sinαcosα/sinαcosα=2

Answer 2

ueei