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Simplify the following:(pq-qr+ pr) (pq+q...

Simplify the following:(pq-qr+ pr) (pq+qr)-(pr+pq) (p+q-r).

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The correct Answer is:
`p^(2)q^(2)-q^(2)r^(2)+pq^(2)r-pq^(2)r+p^(2)qr+pqr^(2)-p^(2)q-pq^(2)-p^(2)r+pr^(2)`
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