Simplify: -pqr(p^2+q^2+r^2)
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Answer:
(p2-q2r)2+2p2q2r
=2p^2-2q^2r+2p^2q^2r
=2p^2(-2q^2r+2q^2r)
=2p^2×0
=0(ANSWER)
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