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Mathematics 9 Online
OpenStudy (anonymous):

Solve on the interval [0, 2pi): (cos x +1)(2cos^2 x -3cosx -2) = 0?

OpenStudy (anonymous):

Replace Cos[x] with y and expand out the LHS. The result on the LHS is factorable to (y-2) (y+1) (2 y+1).

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