## Calculus 8th Edition

$$A=(11\pi-2\sqrt 2)$$ or $$A=17.6$$
$$A=2.\frac{1}{2}\int_{\pi/4}^{5\pi/4}(3+2cos\theta)^{2}d \theta$$ or, $$A=\int_{\pi/4}^{5\pi/4}(11+12cos\theta+2cos2\theta)d \theta$$ Thus, $$A=[11\theta+12sin\theta+sin2\theta]_{\pi/4}^{5\pi/4}=(11\pi-2\sqrt 2)$$ or $$A=17.6$$