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The equation (cosp - 1) x^2 +cosp x + si...

The equation `(cosp - 1) x^2 +cosp x + sinp = 0` where x is a variable, has real roots. then the interval of p may be any one of the following :

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`D>=0`
`b^2-4ac>=0`
`cos^2P-4(cosP-1)sinP>=0`
`c^2P>=4(cosP-1)sinP`
`0<=cos^2P<=1`
`sinP>=0`
`P in[0,pi]`
`(-1/sqrt2)^2>=4(-1/sqrt2=1)-1/sqrt2`
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