Сумма и произведение корней
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5*pi pi | |2 I*\/ 5 || | |2 I*\/ 5 || | |2 I*\/ 5 || | |2 I*\/ 5 ||
- ---- - -- + 2*re|atan|- - -------|| + 2*I*im|atan|- - -------|| + 2*re|atan|- + -------|| + 2*I*im|atan|- + -------||
6 6 \ \3 3 // \ \3 3 // \ \3 3 // \ \3 3 //
$$\left(\left(- \frac{5 \pi}{6} - \frac{\pi}{6}\right) + \left(2 \operatorname{re}{\left(\operatorname{atan}{\left(\frac{2}{3} - \frac{\sqrt{5} i}{3} \right)}\right)} + 2 i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{2}{3} - \frac{\sqrt{5} i}{3} \right)}\right)}\right)\right) + \left(2 \operatorname{re}{\left(\operatorname{atan}{\left(\frac{2}{3} + \frac{\sqrt{5} i}{3} \right)}\right)} + 2 i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{2}{3} + \frac{\sqrt{5} i}{3} \right)}\right)}\right)$$
/ / ___\\ / / ___\\ / / ___\\ / / ___\\
| |2 I*\/ 5 || | |2 I*\/ 5 || | |2 I*\/ 5 || | |2 I*\/ 5 ||
-pi + 2*re|atan|- - -------|| + 2*re|atan|- + -------|| + 2*I*im|atan|- - -------|| + 2*I*im|atan|- + -------||
\ \3 3 // \ \3 3 // \ \3 3 // \ \3 3 //$$- \pi + 2 \operatorname{re}{\left(\operatorname{atan}{\left(\frac{2}{3} - \frac{\sqrt{5} i}{3} \right)}\right)} + 2 \operatorname{re}{\left(\operatorname{atan}{\left(\frac{2}{3} + \frac{\sqrt{5} i}{3} \right)}\right)} + 2 i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{2}{3} - \frac{\sqrt{5} i}{3} \right)}\right)} + 2 i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{2}{3} + \frac{\sqrt{5} i}{3} \right)}\right)}$$
/ / / ___\\ / / ___\\\ / / / ___\\ / / ___\\\
-5*pi -pi | | |2 I*\/ 5 || | |2 I*\/ 5 ||| | | |2 I*\/ 5 || | |2 I*\/ 5 |||
-----*----*|2*re|atan|- - -------|| + 2*I*im|atan|- - -------|||*|2*re|atan|- + -------|| + 2*I*im|atan|- + -------|||
6 6 \ \ \3 3 // \ \3 3 /// \ \ \3 3 // \ \3 3 ///
$$- \frac{5 \pi}{6} \left(- \frac{\pi}{6}\right) \left(2 \operatorname{re}{\left(\operatorname{atan}{\left(\frac{2}{3} - \frac{\sqrt{5} i}{3} \right)}\right)} + 2 i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{2}{3} - \frac{\sqrt{5} i}{3} \right)}\right)}\right) \left(2 \operatorname{re}{\left(\operatorname{atan}{\left(\frac{2}{3} + \frac{\sqrt{5} i}{3} \right)}\right)} + 2 i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{2}{3} + \frac{\sqrt{5} i}{3} \right)}\right)}\right)$$
/ / / ___\\ / / ___\\\ / / / ___\\ / / ___\\\
2 | | |2 I*\/ 5 || | |2 I*\/ 5 ||| | | |2 I*\/ 5 || | |2 I*\/ 5 |||
5*pi *|I*im|atan|- - -------|| + re|atan|- - -------|||*|I*im|atan|- + -------|| + re|atan|- + -------|||
\ \ \3 3 // \ \3 3 /// \ \ \3 3 // \ \3 3 ///
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9 $$\frac{5 \pi^{2} \left(\operatorname{re}{\left(\operatorname{atan}{\left(\frac{2}{3} - \frac{\sqrt{5} i}{3} \right)}\right)} + i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{2}{3} - \frac{\sqrt{5} i}{3} \right)}\right)}\right) \left(\operatorname{re}{\left(\operatorname{atan}{\left(\frac{2}{3} + \frac{\sqrt{5} i}{3} \right)}\right)} + i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{2}{3} + \frac{\sqrt{5} i}{3} \right)}\right)}\right)}{9}$$