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Solve 2cosxsinx + sinx = 0 using unit circle.

  • Trig -

    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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