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If a,b,c are roots of x^3-px^2+qx-r=0 an...

If a,b,c are roots of `x^3-px^2+qx-r=0` and r `ne` 0, then find `(1)/(a^2)+(1)/(b^2)+(1)/(c^2)` in terms of p,q,r.

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The correct Answer is:
`=(q^2-2pr)/(r^2)`
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