Integral de cos(a*x)/e^t dx
Solución
Respuesta (Indefinida)
[src]
/
| // x for a = 0\
| cos(a*x) || | -t
| -------- dx = C + |
$$\int \frac{\cos{\left(a x \right)}}{e^{t}}\, dx = C + \left(\begin{cases} x & \text{for}\: a = 0 \\\frac{\sin{\left(a x \right)}}{a} & \text{otherwise} \end{cases}\right) e^{- t}$$
/ -t
| -t e *sin(a)
|zoo*cos(zoo*a)*e - ---------- for And(a > -oo, a < oo, a != 0)
< a
|
| / -t\ -t
\ oo*sign\e / - e otherwise
$$\begin{cases} \tilde{\infty} e^{- t} \cos{\left(\tilde{\infty} a \right)} - \frac{e^{- t} \sin{\left(a \right)}}{a} & \text{for}\: a > -\infty \wedge a < \infty \wedge a \neq 0 \\\infty \operatorname{sign}{\left(e^{- t} \right)} - e^{- t} & \text{otherwise} \end{cases}$$
=
/ -t
| -t e *sin(a)
|zoo*cos(zoo*a)*e - ---------- for And(a > -oo, a < oo, a != 0)
< a
|
| / -t\ -t
\ oo*sign\e / - e otherwise
$$\begin{cases} \tilde{\infty} e^{- t} \cos{\left(\tilde{\infty} a \right)} - \frac{e^{- t} \sin{\left(a \right)}}{a} & \text{for}\: a > -\infty \wedge a < \infty \wedge a \neq 0 \\\infty \operatorname{sign}{\left(e^{- t} \right)} - e^{- t} & \text{otherwise} \end{cases}$$
Piecewise((±oo*cos(±oo*a)*exp(-t) - exp(-t)*sin(a)/a, (a > -oo)∧(a < oo)∧(Ne(a, 0))), (oo*sign(exp(-t)) - exp(-t), True))
Estos ejemplos se pueden aplicar para introducción de los límites de integración inferior y superior.