Question

(sina+tga):tga=1+cosa

Answer 1

$frac{ sin(a) + tg(a)}{tg(a)} = 1 + cos(a)$

$frac{ sin(a) + tg(a)}{tg(a)} = frac{ sin(a) }{tg(a)} + frac{tg(a)}{tg(a)} = frac{ sin(a) }{ frac{ sin(a) }{ cos(a) } } + 1 = \ \ = cos(a) + 1$


Тождество доказано