No, cartesian product P x Q and Q x P are not same. The number of elements in each set are the same.
Question : If $ p(x+y)^{2}=5$ and $q(x-y)^{2}=3$, then the simplified value of $p^{2}(x+y)^{2}+4pq xy -q^{2}(x-y)^{2}$ is:
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