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Mathematics 8 Online
OpenStudy (anonymous):

Solve cos x + 2√ = -cos x for x over the interval [0,2Π) . A. x=3Π/4 B. x=3Π/4+2nΠ C. x=3Π/4 and 5Π/4 D. x=Π/4 and 7Π/4

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