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Difference of Cubes
An expression of the form a3 - b3. The difference of two cubes factors into (a - b)(a2 + ab + b2).
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Roots
The solutions to y = f (x) when y = 0.
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Sum of Cubes
An expression of the form a3 + b3. The sum of two cubes factors into (a + b)(a2 - ab + b2).