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2-99.

Review the Math Notes box.

Rewrite the first factor using your answer to part (a).

$=\left(\frac{y-x}{xy}\right)\frac{(x+y)}{1}$

Multiply numerator by numerator and denominator by denominator.

$=\frac{xy+y^2-x^2-xy}{xy}=\frac{y^2-x^2}{xy}$