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    kclmrmm1991's Avatar
    kclmrmm1991 Posts: 1, Reputation: 1
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    #1

    Oct 23, 2008, 09:41 PM
    How do you prove a proof?
    cot^2(X) + cos^2(X)+sin^2(X)= csc^2(X)

    My answer that I keep coming up with is cos^2(x), not its reciprical. What am I doing wrong?
    ISneezeFunny's Avatar
    ISneezeFunny Posts: 4,175, Reputation: 821
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    #2

    Oct 23, 2008, 10:24 PM

    cot^2 = 1/tan^2

    tan = sin/cos

    therefore, 1/tan = cos/sin

    cot^2 = cos^2/sin^2

    also

    csc = 1/sin

    so csc^2 = 1/sin^2

    with those identities...

    cos^2/sin^2 + cos^2 + sin^2 = 1/sin^2

    multiply all by sin^2

    cos^2 + cos^2sin^2 + sin^4 = 1

    "undistribute" the sin^2

    sin^2(sin^2 + cos^2) + cos^2 = 1

    I'm sure you can take it from here.

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