Question

(1-cosa+cosb+coach)/(1-cosc+cosa+cosb)=tan(a/2)/tan(b/2) if a+b+c=180

Answer 1

Answer:

if a+b+c = 180°

a+b = (180-c)°

cos(a+b) = cos(180-c) = -(cosc)

cos(c) = -(cos(a+b))

using this value and solving now , we get :-

$\color{red}{Mark\: as\: Brainlist}$