Chapter 10.4, Problem 2PT

The area of the shaded region is given by:

1. a) ${\displaystyle {\int }_0^{\pi /2}\sin 3\theta d\theta }$
2. b) ${\displaystyle {\int }_0^{\pi /2}2{\sin }^{2}3\theta d\theta }$
3. c) ${\displaystyle {\int }_0^{\pi /3}\sin 3\theta d\theta }$
4. d) ${\displaystyle {\int }_0^{\pi /3}2{\sin }^{2}3\theta d\theta }$