(x+y) 2 = x 2 +2xy+y 2
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(x+y)² = (x+y)(x+y)
= x²+xy+yx+y²
= x²+xy+xy+y² [ xy=yx]
= x²+2xy+y²
Hence Proved
= x²+xy+yx+y²
= x²+xy+xy+y² [ xy=yx]
= x²+2xy+y²
Hence Proved
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