factorise (p+q)²-(p-q)²
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(p+q)²-(p-q)² ;[ formula=(a+b)=(a²+2ab+b²).
(p²+2pq+q²)-(p²-2pq+q²)
p²+p²+2pq-2pq+q²+q²
2p²+2q²
2(p²+q²) Answer............ sahi hai tho like.........
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