If x frac y 2 evaluate left frac x 3 y 3 frac 1... - JAMB Mathematics 2001 Question

If \(x = \frac{y}{2}\),evaluate\(\left(\frac{x^{3}}{y^{3}}+\frac{1}{2}\right) \div \left(\frac{1}{2} - \frac{x^{2}}{y^{2}}\right)\)