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If alpha, beta are the roots of x^2 + p...

If `alpha, beta` are the roots of `x^2 + px -q=0` and `gamma,delta` are that of `x^2+px+r=0` then `(alpha-gamma)(beta-gamma)(alpha-delta)(beta-delta)=` (1) `(q-r)^2` (2) `(q+r)^2` (3) `-(r+r)^2` (4) `-(q-r)^2`

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