Question 167821
Simplify by removing non-positive exponents: x^-1 + y^-1 / x^-2 - y^-2
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{{{(x^-1 + y^-1)/(x^-2 - y^-2)}}}
Multiply by x^2
{{{(x + x^2y^-1)/(1 - x^2y^-2)}}}
Multiply by y^2
{{{(xy^2 + x^2y)/(y^2 - x^2)}}}
Factor
{{{xy*(y +x)/((y+x)*(y-x))}}}
= xy/(y-x)