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If alpha,beta are the roots of the equa...

If `alpha,beta` are the roots of the equation`x^2+p x+1=0;gamma,delta` the roots of the equation `x^2+q x+1=0` , then `(alpha-gamma)(alpha+delta)(beta-gamma)(beta+delta)=` (a)`q^2-p^2` (b) `p^2-q^2` (c) `p^2=q^2` (d) none of these

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