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