Question

sin^2*3a-sin^2*a = sin4a*sin2a Prove..

Answer 1

two identities that CAN USE sin a + sin b = 2sin a+b/2 cos a-b/2 and sin a- sin b= 2 sin a-b/2 cos a+b/2 and third one 2sina cos a =sin2a

Answer 2

yea.. but it on ^2

Answer 3

den ur ALGEBRA is weak... :P
PS- a^2 - b^2 = (a+b)(a-b)

Answer 4

im stuck.. give me another hint (;