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Math Help - Trig Problem

  1. #1
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    Trig Problem

    Solve for x, (0<x<2π): 2cos²x-5cosx = 3
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  2. #2
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    2\cos^2{x} - 5\cos{x} = 3

    2\cos^2{x} - 5\cos{x} - 3 = 0

    (2\cos{x} + 1)(\cos{x} - 3) = 0

    can you finish?
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