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Let alpha and beta(alpha<beta) and c&lt;...

Let `alpha` and `beta(alpha

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`x^2+bx+c=0`
`x=(-bpmsqrt(b^2-4c))/2`
`b^2-4c>b^2`
`sqrt(b^2-4c)>|b|`
`|alpha|>beta`
`-alpha>beta`
`alpha+beta=alphabeta-b+C<0`
`alpha^2beta+alphabeta^2=alphabeta(alpha+beta)<0`
...
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