Solve
$(p + q - r)^{2} - (p - q + r)^{2}$

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Solution

Now,
$= (p^{2} + q^{2} + r^{2} + 2 p q - 2 q r - 2 p r) - (p^{2} + q^{2} + r^{2} - 2 p q + 2 p r - 2 q r)$
hence we get
$= 4 p q - 4 p r$

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