Find the number of solution(s) of the fo...

Find the number of solution(s) of the following questions (a) `x^2 + x + 1 + sinx = 0, x in [0, 2pi]` (b) `x^2 + x + 1 + sinx = 0, x in [pi, 2pi]` (c) `x^2 + x + sinx = 0, x in [0, pi]`

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