Question

If A+B+C=180°,prove that Sin2A + Sin2B - Sin2C = 4 COSA COSB.SinC​

Answer 1

Answer:

When the humid shadows hover (repetition of h sound). Overall the starry spheres (repetition of s sound). Press the pillow (repetition p sound). Cottage chamber bed

Answer 2

Answer:

Solution :-

A+B+C=180

LHS=sin

2A+sin2B+sin2C=2sin

(A+B)cos(A−B)+2sinCcosC=2sin

Ccos(A−B)+2sinCcosC=2sinC(cos(A−B)

+cosC)=2sinC(cos(A−B)

−cos(A+B))=2sinC2sin

AsinB=4sinAsinBsinC=RHS