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Sum By Difference
(a + b) (a - b) = a² - b²
The Square of a Binomial
(a + b)² = a² + 2ab + b²
(a - b)² = a² - 2ab + b²
Sum of Cubes = a³ + b³
(a + b) (a² - ab + b²)
Difference of Cubes = a³ - b³
(a - b) (a² + ab + b²)