Question

(1/2 * x - 1/3 * y)(1/4 * x ^ 2 + 1/6 * x * y + 1/9 * y ^ 2)​

Answer 1

$(\frac{1}{2} x - \frac{1}{3} y)( \frac{1}{4} {x}^{2} + \frac{1}{6} xy + \frac{1}{9} {y}^{2} ) = \\ = { (\frac{1}{2}x) }^{3} - {( \frac{1}{3} y)}^{3} = \frac{ {x}^{3} }{8} - \frac{ {y}^{3} }{27}$