`4 sinA*Sin [(π/3) + A ] * Sin [(2π)/3 + A ] = Sin 3A`

(sin A + 2 sin 3 A + sin 5 A) / (sin 3 A + 2 sin 5 A + sin 7 A) = (sin3A) /(sin 5 A)

sin3A=3sin A-4sin^(3)A

(sin A sin2A + sin3A sin6A + sin4A sin13A) / (sin A cos2A + sin3A cos6A + sin4A cos13A) = tan9A

sin4A = 4sin A cos ^ (3) A-4cos A sin ^ (3) A

sin4A = 4sin A * cos ^ (3) A-4cos A * sin ^ (3) A

(sin A sin2A + sin3A sin6A) / (sin A cos2A + sin3A cos6A) = tan5A

Show : (( Sin^3A + Cos^3A ) /( SinA + CosA ) ) = 1 - SinACosA

In triangle ABC, sinA sin B + sin B sin C + sin C sin A = 9//4 and a = 2 , then the value of sqrt3 Delta , where Delta is the area of triangle, is _______

Prove that: (cos 2A cos 3A -cos 2A cos 7A + cos A cos 10A)/("sin" 4A sin 3A - sin 2A sin 5A + sin 4A sin 7A) = cot 6A cot 5A