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Math Help - Evaluate 1-2(cos^2)25/1-2(sin^2)65

  1. #1
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    Evaluate 1-2(cos^2)25/1-2(sin^2)65

    Help me out with this evaluate question plz..


    Evaluate:

    1-2(cos^2)25/1-2(sin^2)65
    Give the answer in surd form


    I did some steps but donít know if itís wrong or right
    -cos2(25)/cos2(65)
    -cos50/cos130
    Donít know how to take it any further...
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  2. #2
    MHF Contributor harish21's Avatar
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    \cos(180-x)=-\cos(x)

    -\cos(50)=-[\cos(180-130)]=...
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