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

    Jun 29, 2010, 10:19 AM
    Can you help me to establish identity of csc^2u-csc u sec u=cot^2 u
    Can you help me to establish identity of csc^2u-csc u sec u=cot^2 u
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Jun 29, 2010, 10:37 AM

    This is not a valid identity.




    Even solving as an equation it has no solutions in the reals.

    Are you sure there is no typo?

    There are a few identities to keep in mind.



    By the given problem, then .

    This is not true regardless of the value of x.

    Here is a graph of and .

    If they were equal, then the graph of each would overlap and be the same. They are not.
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