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

    Feb 15, 2013, 02:49 AM
    verifying identities solver
    sec^2xcotx-cotx+tanx ? Verify id
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Feb 15, 2013, 07:25 AM
    You forgot an equals sign. I think what you mean is:

    sec^2xcotx = cotx+tanx

    As usual for these types of prioblems, start by replacing the sec, tan, and cot functions with their sin and cos equivalents, and then simplify. This one works right out - the only trick is to remember that cos^2x + sin^2x = 1.
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