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The equation (cosp-1)x^2+(cos p)x+sin p=...

The equation `(cosp-1)x^2+(cos p)x+sin p=0` in the variable `x` has real roots. The `p` can take any value in the interval (a)`(0,2pi)` (b) `(-pi,0)` (c) `(-pi/2,pi/2)` (d) `(0,pi)`

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