Prove the identity cot A/2 - tan A/2 = 2cot A

I have written it as:

Taking LCM:

Now I don't know how to solve it any further?

Is there any easier method of proving this identity ?

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- Jul 21st 2009, 01:16 PMstruckProving an identity that's proving to be complex
Prove the identity cot A/2 - tan A/2 = 2cot A

I have written it as:

Taking LCM:

Now I don't know how to solve it any further?

Is there any easier method of proving this identity ? - Jul 21st 2009, 01:30 PMe^(i*pi)