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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Originally Posted by struck 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 ? I'd do it your way too and you were only two steps away from the end. Carrying on: For the numerator recall that For the denominator recall that This will reduce your equation to which I'm sure you can simplify to get the answer
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