/1 cos(k)
|- - ------ for And(k > -oo, k < oo, k != 0)
$$\begin{cases} - \frac{\cos{\left(k \right)}}{k} + \frac{1}{k} & \text{for}\: k > -\infty \wedge k < \infty \wedge k \neq 0 \\0 & \text{otherwise} \end{cases}$$
/1 cos(k)
|- - ------ for And(k > -oo, k < oo, k != 0)
$$\begin{cases} - \frac{\cos{\left(k \right)}}{k} + \frac{1}{k} & \text{for}\: k > -\infty \wedge k < \infty \wedge k \neq 0 \\0 & \text{otherwise} \end{cases}$$
Ответ (Неопределённый)
[src] / //-cos(k*x) \
| ||---------- for k != 0|
| sin(k*x) dx = C + |< k |
| || |
/ \\ 0 otherwise /
$$\int \sin{\left(k x \right)}\, dx = C + \begin{cases} - \frac{\cos{\left(k x \right)}}{k} & \text{for}\: k \neq 0 \\0 & \text{otherwise} \end{cases}$$