Problem

Problem

If the equation psin⁡2x+cos⁡x=pp\sin 2x+\cos x=p has a solution, then the range of pp is (a) (−∞,∞)(-\infty, \infty) (b) [−1,1][-1, 1] (c) (−∞,0](-\infty, 0] (d) [0,∞)[0, \infty)

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