докажите справедливость равенства: (x-y)^2 + (x+y)^2 = 2(x^2 + y^2)
x^2-2xy+y^2+x^2+2xy+y^2=2x^2+2y^22x^2+2y^2=2x^2+2y^2
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x^2-2xy+y^2+x^2+2xy+y^2=2x^2+2y^2
2x^2+2y^2=2x^2+2y^2