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    fletcher123's Avatar
    fletcher123 Posts: 1, Reputation: 1
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    #1

    Dec 9, 2009, 12:24 PM
    Having hard time with this trig proof
    (Sin / 1+sin) + sec^2 = tan sec + 1

    please help
    Alty's Avatar
    Alty Posts: 28,317, Reputation: 5972
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    #2

    Dec 9, 2009, 12:27 PM

    What have you figured out so far?

    Post the work you've already done and then we can tell you where you went wrong.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #3

    Dec 11, 2009, 01:33 PM

    What you have written appears to be this:



    It is always good with this type of problem to first convert the tan(x) and sec(x) functions into their sin(x) and cos(x) equivalents. Then it's just a matter of combining fractions, and using identities such as cos^2(x) = 1 - sin^2(x). Post back if you're still having difficulty, but show us what you've tried.
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