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    Mcalist Posts: 1, Reputation: 1
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    #1

    Mar 5, 2012, 08:17 PM
    need help verifying/transforming a trig problem
    sec(x)-cos(x)/tan(x)=sin(x)
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Mar 6, 2012, 09:32 AM
    The equation is incorrect as written. I think you actually meant this:

    (sec(x)-cos(x))/tan(x) = sin(x)

    To prove this simply replace sec(x) with 1/cos(x) and tan(x) with sin(x)/cos(x). Then you can apply the idfentity 1-cos^2(x) = sin^2(x), and it falls right out.
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