$$\pi\cdot sin\frac{\pi}{4}+3\ \cos^{2}\frac{\pi}{2}-3\ an\frac{2\pi}{4}+3\ \cos^{4}\frac{\pi}{2}$$
$\frac{\pi \left(-3an+\sqrt{2}\right)}{2}$
$$\frac{2\pi \sin(\frac{\pi }{4})+6\left(\cos(\frac{\pi }{2})\right)^{2}-3an\pi +6\left(\cos(\frac{\pi }{2})\right)^{4}}{2}$$
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