## Functions Modeling Change: A Preparation for Calculus, 5th Edition

$$\sqrt{\frac{3}{2}}$$
Finding the exact value using the Laws of Trigonometry, we obtain: $$2\cos \left(45^{\circ \:}\right)\cos \left(30^{\circ \:}\right) \\ 2\cdot \frac{\sqrt{2}}{2}\cdot \frac{\sqrt{3}}{2} \\ \sqrt{\frac{3}{2}}$$