prove that:

1.

2.

please help...

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- Nov 23rd 2011, 08:34 PMearthboytrignometric identities
prove that:

1.

2.

please help... - Nov 23rd 2011, 08:47 PMpickslidesRe: trignometric identities
What have you tried to this point?

I suggest thinking about some double angle formulas for the first question. - Nov 23rd 2011, 09:14 PMearthboyRe: trignometric identities
i tried using the double angle formulas but dont know how to bring about the cot(A/2) for the first one .

- Nov 24th 2011, 12:03 AMSironRe: trignometric identities
For the first one I think it can be useful to work with the identities:

- Nov 24th 2011, 03:59 AMearthboyRe: trignometric identities
i did the fiirst one.

what about the second one?? - Nov 24th 2011, 05:42 AMe^(i*pi)Re: trignometric identities
- Nov 24th 2011, 06:56 AMSorobanRe: trignometric identities
Hello, earthboy!

Quote:

Right side: .

Multiply by

. . . . . . . . . . . .