how to solve this: 2(cosy-cosx)/(sinx*siny)=tan(x/2)cot(y/2)-cot(x/2)tan(y/2)
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Originally Posted by Garas how to solve this: 2(cosy-cosx)/(sinx*siny)=tan(x/2)cot(y/2)-cot(x/2)tan(y/2) Look at this table and you should be able to figure show that your equality holds. List of trigonometric identities - Wikipedia, the free encyclopedia
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