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2.(6pq+5hr)(6pq-5hr)
=(6pq dikali 6pq)+(6pq dikali -5hr)+(5hr dikali 6pq)+(5hr dikali -5hr)
=36pq²+(-30hpqr)+30hpqr+(-25hr²)
=36pq²-30hpqr+30hpqr-25hr²
=36pq²-25hr²