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If we let $p, q, r$ and $s$ to represents the 4 roots of the equation $ax^4 + bx^3 + cx^2 + dx + e = 0$, we're told that $pq=rs$.The product of two of the roots of the equation ax^4 + bx^3 + cx^2 + dx + e = 0 is equal to the product of the other two roots. Prove that a*d^2 = b^2 * e