If x - y = \(\frac{7}{4}\) and \(\frac{1}{x}-\frac{1}{y}=\frac{14}{3}\), then x3 - y3 is equal to:
\(\frac{433}{32}\)
\(\frac{433}{64}\)
\(\frac{217}{64}\)
\(\frac{217}{32}\)
If x2 + 1 - 2x = 0, x > 0, then x2 (x2 - 2) = ______
The coefficient of x3y in (x − 2y)(5x + y)3 is: