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    boergoat's Avatar
    boergoat Posts: 9, Reputation: 1
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    #1

    Feb 18, 2008, 05:39 PM
    pre cal verify
    sec^4x - 3sec^2x - 4 = 0
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Feb 18, 2008, 06:09 PM
    A way to go about a problem like this is to let

    Then you get a quadratic you can solve:
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