$$2 \operatorname{atan}{\left(\tanh{\left(\frac{1}{2} \right)} \right)}$$
$$2 \operatorname{atan}{\left(\tanh{\left(\frac{1}{2} \right)} \right)}$$
Ответ (Неопределённый)
[src] /
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| 1 / /x\\
| 1*------- dx = C + 2*atan|tanh|-||
| cosh(x) \ \2//
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$$\int 1 \cdot \frac{1}{\cosh{\left(x \right)}}\, dx = C + 2 \operatorname{atan}{\left(\tanh{\left(\frac{x}{2} \right)} \right)}$$