Am between (x+y)^2 and (x-y)^2
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Am= (x+y)²+(x-y)² ÷ 2
=x²+y²+2xy+x²+y²-2xy ÷ 2
=2x²+2y² ÷ 2
=2(x²+y²)÷ 2
Am =x²+y²
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