a³ + b³ = (a + b)(a² - ab + b²)
(a - b)² = a² - 2ab + b²
(43³ + 32³)/75 - 43*32 = (43 + 32)(43² - 43*32 + 32²)/75 - 43*32 =
75* (43² - 43*32 + 32²)/75 - 43*32 = 43² - 43*32 + 32² - 43*32 =
43² - 2*43*32 + 32² = (43 - 32)² = (11)² = 121
