(х+y)^2+(x-y)^2=x^2+2xy+y^2 + x^2-2xy+y^2=2x^2+ 2y^2=2(x^2+y^2)
x/y+ y/x=(x^2+y^2)/xy
2(x^2+y^2)/[(x^2+y^2)/xy]=2xy
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(х+y)^2+(x-y)^2=x^2+2xy+y^2 + x^2-2xy+y^2=2x^2+ 2y^2=2(x^2+y^2)
x/y+ y/x=(x^2+y^2)/xy
2(x^2+y^2)/[(x^2+y^2)/xy]=2xy