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

    Jan 4, 2011, 08:51 PM
    Precal Factoring problem
    2cos^2(x)+7cos(x)+4=0
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Jan 5, 2011, 03:36 PM

    You can apply the quadratic equation to find values of cos(x) that satisfy this.
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