Fuente TeX:

=\frac{\sqrt{2}}{2} 2\pi \left(-\frac{2^{4}}{4}+4\frac{2^{3}}{3}-2\frac{2^{2}}{2} + \frac{1^{4}}{4}-4\frac{1^{3}}{3}+2\frac{1^{2}}{2}\right)