sin(a+b) __________= tga+tgb cosacosb

Question

sin(a+b)

__________= tga+tgb

cosacosb

Answer 1

tg a + tg b = sin a /cosa + sin b / cos b = (sin a * cos b + sin b * cos a) / (cos a * cos b) =

  sin (a + b) / (cos a * cos b)