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(C) The area $A$ is given by the integral of the absolute difference between the two curves over the interval $[\frac{\pi}{4}, \frac{5\pi}{4}]$.$A = \

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$2 \sqrt{2}$

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(C) The area $A$ is given by the integral of the absolute difference between the two curves over the interval $[\frac{\pi}{4}, \frac{5\pi}{4}]$.$A = \int_{\frac{\pi}{4}}^{\frac{5\pi}{4}} |\sin x - \cos x| \, dx$.In the interval $[\frac{\pi}{4}, \frac{5\pi}{4}]$,$\sin x \geq \cos x$.Thus,$A = \int_{\frac{\pi}{4}}^{\frac{5\pi}{4}} (\sin x - \cos x) \, dx$.$A = [-\cos x - \sin x]_{\frac{\pi}{4}}^{\frac{5\pi}{4}}$.$A = (-(\cos \frac{5\pi}{4} + \sin \frac{5\pi}{4})) - (-(\cos \frac{\pi}{4} + \sin \frac{\pi}{4}))$.$A = (-(-\frac{1}{\sqrt{2}} - \frac{1}{\sqrt{2}})) - (-(\frac{1}{\sqrt{2}} + \frac{1}{\sqrt{2}}))$.$A = (\frac{2}{\sqrt{2}}) - (-\frac{2}{\sqrt{2}}) = \sqrt{2} + \sqrt{2} = 2\sqrt{2}$ square units.

The area (in square units) enclosed between the curves $y=\sin x$ and $y=\cos x$ for $\frac{\pi}{4} \leq x \leq \frac{5 \pi}{4}$ is

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