Integraal van $$$\frac{e^{x}}{x e^{2}}$$$

Bepaal $$$\int \frac{e^{x}}{x e^{2}}\, dx$$$.

De invoer is herschreven: $$$\int{\frac{e^{x}}{x e^{2}} d x}=\int{\frac{e^{x - 2}}{x} d x}$$$.

Herschrijf de integraand:

$${\color{red}{\int{\frac{e^{x - 2}}{x} d x}}} = {\color{red}{\int{\frac{e^{x}}{x e^{2}} d x}}}$$

Pas de constante-veelvoudregel $$$\int c f{\left(x \right)}\, dx = c \int f{\left(x \right)}\, dx$$$ toe met $$$c=e^{-2}$$$ en $$$f{\left(x \right)} = \frac{e^{x}}{x}$$$:

$${\color{red}{\int{\frac{e^{x}}{x e^{2}} d x}}} = {\color{red}{\frac{\int{\frac{e^{x}}{x} d x}}{e^{2}}}}$$

Deze integraal (Exponentiële integraal) heeft geen gesloten vorm:

$$\frac{{\color{red}{\int{\frac{e^{x}}{x} d x}}}}{e^{2}} = \frac{{\color{red}{\operatorname{Ei}{\left(x \right)}}}}{e^{2}}$$

Dus,

$$\int{\frac{e^{x - 2}}{x} d x} = \frac{\operatorname{Ei}{\left(x \right)}}{e^{2}}$$

Voeg de integratieconstante toe:

$$\int{\frac{e^{x - 2}}{x} d x} = \frac{\operatorname{Ei}{\left(x \right)}}{e^{2}}+C$$

$$$\int \frac{e^{x}}{x e^{2}}\, dx = \frac{\operatorname{Ei}{\left(x \right)}}{e^{2}} + C$$$A