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    swetagpt87's Avatar
    swetagpt87 Posts: 2, Reputation: 1
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    #1

    Sep 29, 2011, 06:23 PM
    Verifying Trigonometric Identity
    (1-2cos^2(x))/(sin(x)cos(x))=tan(x)cot(x)
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
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    #2

    Sep 29, 2011, 09:21 PM
    Are you sure you wrote it down correctly? The right-hand side of the equation simplifies to 1. However, that's not what the left-hand side comes out to for most values of x. You can't verify something that's not true!
    sydneycalvo's Avatar
    sydneycalvo Posts: 2, Reputation: 2
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    #3

    Oct 3, 2011, 11:37 AM
    (SINX/cosx)(cosx/sinx)cross multiply 2sin^2x+2cos^2x/cosxsinx=1-2cos^x/sinxcosx to get cancel 2sin^2x/sinx
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
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    #4

    Oct 3, 2011, 12:13 PM
    Aaah, there's the problem! You missed a PLUS SIGN on the right-hand side of the equation. It should be tan(x) + cot(x). In that case, do just what Sydney said above.
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