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Q=x2+y2-2xy
entonces P+Q/P-Q
x2+y2+2xy+x2+y2-2xy/x2+y2+2xy-(x2+y2-2xy)
2x2+2y2/4xy
quedaria x2+y2/2(xy)
OJO: x2 y y2 significa x elevado al cuadrado