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

    Mar 26, 2013, 11:47 AM
    trouble with problem
    cot^(2)(x)*cos^(2)(x)=cot^(2)(x)-cos^(2)(x)
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    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Mar 26, 2013, 01:22 PM
    As usual for this type of problem it helps to start by converting the cotangent functions to its sine and cosine equivalent, then simplify the resulting expression. Look for opportunities to cancel terms, or to apply well known identities such as sin^2x + cos^2x =1.
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