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posted by don Wednesday, November 2, 2011 at 10:03pm.

Solve 2cosxsinx + sinx = 0 using unit circle.

2cosxsinx + sinx = 0 sinx(2cosx + 1) = 0 sinx = 0 or cosx = -1/2 x = 0, π, 2π or x = 2π/3, 4π/3

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