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f x+y f x +f y -2f x f y
f x y x 2 + y 2
y f x vs y 2f x
f x y y - 2.*x.y
f x y xy x2 + y2
f x+y xy x 2+y 2
f x y e 2x x+y 2+2y
f x+y xy x 2+y 2-xy
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