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    prove the identity

    Cos(theta)/(1 + Cos(theta)) = Cot(theta) ( Cosec(theta) - Cot(theta))
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    (Original post by apaul322)
    prove the identity

    Cos(theta)/(1 + Cos(theta)) = Cot(theta) ( Cosec(theta) - Cot(theta))
    Start with the more difficult side. R.H.S,
    Always helps
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    (Original post by apaul322)
    prove the identity

    Cos(theta)/(1 + Cos(theta)) = Cot(theta) ( Cosec(theta) - Cot(theta))
    are you sure, left hand side is
    \dfrac{cos\theta}{1+cos\theta} ?
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    (Original post by joyoustele)
    are you sure, left hand side is
    \dfrac{cos\theta}{1+cos\theta} ?
    yes according to the paper
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    (Original post by apaul322)
    prove the identity

    Cos(theta)/(1 + Cos(theta)) = Cot(theta) ( Cosec(theta) - Cot(theta))
    You can start with the RHS, but I'll start with the LHS as that's my habit (though I'd agree to say that starting from RHS gives you more 'obvious' approaches to the problem here)

    So from the LHS, multiply top and bottom by 1-\cos(\theta) and move on from there with some pretty obvious identities.
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    (Original post by apaul322)
    prove the identity

    Cos(theta)/(1 + Cos(theta)) = Cot(theta) ( Cosec(theta) - Cot(theta))
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