Question

21. In A ABC, if 2s = a + b + c, then the value of
s(s-a)/bc- (s-b)(s-c)/bc=

(a) sin A
(b) cos A
(c) tan A
(d) None of these.​

Answer 1

Answer:

This is the formula of sin x

S(s-a) /bc-s(s-b) (s-c) /bc