simplify :(4pq+3q)² - (4 pq -3q)
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(4pq+3q)²- (4pq-3q)
(4pq)²+2×4pq×3q+ (3q)²- (4pq-3q)
16p²q²+24pq²+9q²-(4pq-3q)
16p²q²+24pq²+9q²-4pq+3q
16p²q²+24pq²+9q²+3q-4pq
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