/ / ____ \\
____ | |\/ 15 *tan(1/2)||
____ 2*\/ 15 *|-pi + atan|---------------||
2*pi*\/ 15 \ \ 5 //
----------- + --------------------------------------
15 15
$$\frac{2 \sqrt{15} \left(- \pi + \operatorname{atan}{\left(\frac{\sqrt{15} \tan{\left(\frac{1}{2} \right)}}{5} \right)}\right)}{15} + \frac{2 \sqrt{15} \pi}{15}$$
/ / ____ \\
____ | |\/ 15 *tan(1/2)||
____ 2*\/ 15 *|-pi + atan|---------------||
2*pi*\/ 15 \ \ 5 //
----------- + --------------------------------------
15 15
$$\frac{2 \sqrt{15} \left(- \pi + \operatorname{atan}{\left(\frac{\sqrt{15} \tan{\left(\frac{1}{2} \right)}}{5} \right)}\right)}{15} + \frac{2 \sqrt{15} \pi}{15}$$
Ответ (Неопределённый)
[src] / /x pi\ / ____ /x\\\
| |- - --| |\/ 15 *tan|-|||
/ ____ | |2 2 | | \2/||
| 2*\/ 15 *|pi*floor|------| + atan|-------------||
| 1 \ \ pi / \ 5 //
| 1*---------- dx = C + -------------------------------------------------
| 4 + cos(x) 15
|
/
$$\int 1 \cdot \frac{1}{\cos{\left(x \right)} + 4}\, dx = C + \frac{2 \sqrt{15} \left(\operatorname{atan}{\left(\frac{\sqrt{15} \tan{\left(\frac{x}{2} \right)}}{5} \right)} + \pi \left\lfloor{\frac{\frac{x}{2} - \frac{\pi}{2}}{\pi}}\right\rfloor\right)}{15}$$