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Math Help - Deriving an Identity from another

  1. #1
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    Deriving an Identity from another

    I have been trying to work out a problem from my homework set and cannot get it. I have to use the identity

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

    to derive the identity

    tan^2(x) + 1 = sec^2(x)

    I would appreciate it if someone could just give me a hint on how to solve this problem. I have tried this numerous ways but cannot get it.

    Thanks
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  2. #2
    o_O
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    Divide both sides by \cos^2 x. See what you get
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  3. #3
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    Thanks! I tried everything else except that I cannot believe I missed that
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