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Math Help - 2(cosy-cosx)/(sinx*siny)

  1. #1
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    2(cosy-cosx)/(sinx*siny)

    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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  2. #2
    MHF Contributor harish21's Avatar
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    Quote Originally Posted by Garas View Post
    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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