Упростите sin(a+b)+sin(a-b)/sin(a+b)-sin(a-b)

Question

Упростите sin(a+b)+sin(a-b)/sin(a+b)-sin(a-b)

Answer 1

(sinacosb+sinbcosa+sinacosb-sinbcosa)/(sinacosb+sinbcosa-sinacosb+sinbcosa)=2sinacosb/(2sinbcosa)=tgactgb