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    dtrip369's Avatar
    dtrip369 Posts: 1, Reputation: 1
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    #1

    Apr 13, 2011, 07:15 PM
    verifying trigonometric identities solver?
    I have a project due tom and I have to answer 16 problems and I need help with 3

    1.TANx(COTx+TANx)=SEC^2x
    2.SINx(1+COT^2x)=CSCx
    3.TANxCOSx=COTx(SECx-COSx)


    Any help will be greatly appreciated thanksssssssss
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    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Apr 14, 2011, 08:21 AM

    1. (left) Expand, and remember one identity.

    2. (left) Substitute cot^2x by 1 + csc^2x and then expand.

    3. (right) Express all in terms of cos and sin. Combine fractions, use the Pythagorean idendity and simplify. You'll see that there is something wrong.
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