Find the value of the following expression:
\[ \frac{\tan^{3}45^{\circ} + 4\cos^{3}60^{\circ}} {2\,\text{cosec}^{2}45^{\circ} - 3\sec^{2}30^{\circ} + \sin30^{\circ}} \]
If 5 sin θ - 4 cos θ = 0, 0° < θ < 90°, then what is the value of
\[ \frac{5\sin\theta + 2\cos\theta}{5\sin\theta + 3\cos\theta} \]