Chapter 11.3, Problem 12E

(a)

To determine

To calculate: The angle $\theta$ between the vectors $\text{u}=\cos \frac{\pi }{6}i+\sin \frac{\pi }{6}j\mathrm{and}\text{v}=\cos \frac{3\pi }{4}i+\sin \frac{3\pi }{4}j$ in radians.

(b)

To determine

To calculate: The angle $\theta$ between the vectors $\text{u}=\cos \frac{\pi }{6}i+\sin \frac{\pi }{6}j\mathrm{and}\text{v}=\cos \frac{3\pi }{4}i+\sin \frac{3\pi }{4}j$ in degrees.