PDA

View Full Version : Prove identities solver

Advance_Girl
Aug 15, 2012, 04:21 AM
sin x + sin 3x + sin 5x + 7x = 4 cos x cos 2x cos 4x
ebaines
Aug 15, 2012, 08:19 AM
Your formula is incorrect. Consider the case x=0: the left hand side equals 0 while the right hand side equals 4.