\(\frac{x^2y}{x^2+y^2}=x^2\frac{y}{x^2(1+\frac{y^2}{x^2})}=\frac{y}{1+\frac{y^2}{x^2}}\)
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\(\frac{x^2y}{x^2+y^2}=x^2\frac{y}{x^2(1+\frac{y^2}{x^2})}=\frac{y}{1+\frac{y^2}{x^2}}\)