Answer
...$=pq\cdot pq\cdot pq\cdot pq=(p\cdot p\cdot p\cdot p)(q\cdot q\cdot q\cdot q)=p^{4}q^{4}$
Work Step by Step
$(pq)^{4}=pq\cdot pq\cdot pq\cdot pq=(p\cdot p\cdot p\cdot p)(q\cdot q\cdot q\cdot q)=p^{4}q^{4}$
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