Question:

Attempt:

I simplifyied using the equation and i reached to a point where my answer is

I have no idea what to do next to prove...

Thank you..

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- Feb 28th 2009, 08:55 AMmj.alawamiProving Sum and difference identities
**Question:**

**Attempt:**

I simplifyied using the equation and i reached to a point where my answer is

I have no idea what to do next to prove...

Thank you.. - Feb 28th 2009, 09:04 AMe^(i*pi)
- Feb 28th 2009, 09:20 AMmj.alawami
- Feb 28th 2009, 09:32 AMReckoner
- Feb 28th 2009, 09:34 AMe^(i*pi)
It came from combining like terms, I could have rearranged them first in an extra step which would be going from:

to

I could also have then simplified each set of brackets to give:

this means the 'main' equation will be :

As is on the top and bottom it can be cancelled to give - Feb 28th 2009, 09:44 AMmj.alawami