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OpenStudy (anonymous):
Use a graphing utility to approximate the solutions (to three decimal places) of the equation in the given interval. cos^2 x - 2 cos x - 1 = 0, [0,pi]
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OpenStudy (anonymous):
1.998 Go to wolframalph.com and type: solve cos^2 x - 2 cos x - 1 = 0
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