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Questions  >>  Olympiad-Math  >>  Class 8
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$(pq-qr)^2+4pq^2r$

$\begin{array}{1 1} (pq-qr)^2 \\ p^2q^2+q^2r^2 \\ (pq+qr)^2 \\ 2pq^2r \end{array} $

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