i don't know thats why i have come here, so please help me
Start with:
Expand the left hand side and equate real parts on both sides of the resulting equation. Now it should be just an exercise in the repeated application of trig identities.
CB
Last edited by CaptainBlack; Jul 8th 2010 at 04:23 AM.
Expand the left hand side and equate real parts on both sides of the resulting equation. Now it should be just an exercise in the repeated application of trig identities.