1.
The area of the region A={(x,y)∣∣cos⁡x−sin⁡x∣≤y≤sin⁡x, 0≤x≤π2}A = \{(x, y) \mid |\cos x - \sin x| \leq y \leq \sin x,\ 0 \leq x \leq \frac{\pi}{2}\} is