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Math Help - Trig Proof

  1. #1
    Junior Member
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    Oct 2008
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    Unhappy Trig Proof

    Need some help on this one. Just not sure where to go, used Sum to Product. That just confused me even more. If someone could show me a couple of step that would be great. thanks.

    2cosΘ+sin2Θ = 2cos^3Θ/ 1-sinΘ
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  2. #2
    MHF Contributor harish21's Avatar
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     2cosx +sin(2x) = 2cosx+2sin(x)cos(x) = 2cosx(1+sinx)

    Then multiply

    2cosx(1+sinx) by \dfrac{(1-sinx)}{(1-sinx)}
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