Simplify (1-r^3)(1-r)^-3

Math
Rewrite the expression using the negative exponent rule .
Multiply and .
Simplify the numerator.
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Rewrite as .
Since both terms are perfect cubes, factor using the difference of cubes formula, where and .
Simplify.
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One to any power is one.
Multiply by .
Cancel the common factors.
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Factor out of .
Cancel the common factor.
Rewrite the expression.
Simplify (1-r^3)(1-r)^-3

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