expansion :-find the square of 2a+b
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(2a+b)² = (2a)² + b² + 2×2a×b
= 4a² + b² + 4ab
[ since, (a+b)² = a² + b² +2ab
= 4a² + b² + 4ab
[ since, (a+b)² = a² + b² +2ab
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