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p^{2}-2pq+q^{2}+q-p
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(p-q\right)^{2}.
p^{2}-2pq+q^{2}+q-p
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(p-q\right)^{2}.