How do I prove that ( (1-cos A) / (1+cos A) ) = (tan (A/2))^2 ? I have tried using the half angle formulae for cos A but have not entirely finished the question.
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Originally Posted by Stuck Man How do I prove that ( (1-cos A) / (1+cos A) ) = (tan (A/2))^2 ? I have tried using the half angle formulae for cos A but have not entirely finished the question.
Thats much shorter than I expected. I used the 'little t' formula for cos A. Thanks.
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