Find the exact value of the product. \( \cos \frac{11 \pi}{24} \sin \frac{5 \pi}{24} \) \( \frac{\sqrt{3}-\sqrt{2}}{4} \) \( \frac{\sqrt{2}+\sqrt{3}}{4} \) \( -\frac{\sqrt{2}+\sqrt{3}}{4} \) \( \frac{