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    lilbajancutie's Avatar
    lilbajancutie Posts: 1, Reputation: 1
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    #1

    Nov 26, 2007, 05:52 PM
    verifying double angles
    1+cos2A= 2/1+tan^(2)A
    red_cartoon's Avatar
    red_cartoon Posts: 52, Reputation: 6
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    #2

    Nov 29, 2007, 11:13 PM
    I don't understand what are you actually looking for, the expression you wrote looks like an identity to me. May be you want to prove that this is correct. Here is a prove :

    1 + cos(2A) = 2 cos²(A) = 2 / sec²(A) = 2 / [ 1 + tan²(A) ]
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