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

    Dec 8, 2010, 08:27 PM
    solve verifying the identity
    csc^4x-cot^4x=csc^2x cot^2x
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    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Dec 9, 2010, 12:24 AM



    Notice that the LHS is a difference of two squares.
    Then, use the fact that
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