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= x^2 + 2xy + y^2 - x^2 + 2xy -y^2
=2xy + 2xy
= 4xy.
(x-y)² = x²-2xy+y²
kalo (x + y)² - (x – y)² berarti:
x²+2xy+y² - x²-2xy+y²
=x²-x² + 2xy-(-2xy) + y²-y²
=0+4xy+0
=4xy