Question

If A=60; show that
Sin 3A = 4 sin A sin (60 - A) sin (60+A)

Answer 1

Answer:

sin3A=4sinA sin(60-A) sin(60+A)

sin3(60)=4sin60 sin(60-60) sin(60+60)

sin180= 2×root3 ×0×sin120

sin180=0

thanks