(a+b)³-(a-b)³ = 3a²b+3ab²
(x+y)³-3xy(x+y) = x³ + y³
(a-b)³+3ab(a-b) = a³ - b³
(3m-n)³-(n+3m)³ = -3m²n
3ab(a+b)-(a+b)³ = 3ab
(m-n)³-(m-n)(m²+mn+n²) = 2m²n - mn²
(a+b)³-(a-b)³ = 3a²b+3ab²
(x+y)³-3xy(x+y) = x³ + y³
(a-b)³+3ab(a-b) = a³ - b³
(3m-n)³-(n+3m)³ = -3m²n
3ab(a+b)-(a+b)³ = 3ab
(m-n)³-(m-n)(m²+mn+n²) = 2m²n - mn²