This is another problem which I am not able to complete
Prove the following identity.
sin(4x) = 8sin(x)cos^3(x)-4sin(x)cos(x)
how did you start it?This is another problem which I am not able to complete
how i did it: factor out from the RHS & use one double-angle ident twice.Prove the following identity.
sin(4x) = 8sin(x)cos^3(x)-4sin(x)cos(x)