Since both terms are perfect cubes, factor using the difference of cubes formula, where and .

Cancel the common factor.

Divide by .

Divide (r^3-s^3)/(r-s)

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# Divide (r^3-s^3)/(r-s)

Since both terms are perfect cubes, factor using the difference of cubes formula, where and .

Cancel the common factor.

Divide by .

Divide (r^3-s^3)/(r-s)