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OpenStudy (anonymous):
Find all solutions in the interval [0,2pi] cos^2x+2cosx+1=0
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OpenStudy (anonymous):
call y = cos x. Solve the quadratic equation: y^2 + 2y + 1 = 0. Double root: y = -1. Cos x = y = -1 --> x = Pi. Check: X= Pi; cos x = -1; f(x) = 1 - 2 + 1 = 0 correct.
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