Calcular la integral $\int\frac{e^{-2x}}{\sqrt{\left(9e^{-2x}+1\right)^{3}}}dx$

Calcular la integral

$\int e^x\sqrt{5+e^x}dx$

Calcular la integral

$\int\frac{1}{e^{2x}-3e^x}dx$

Calcular la integral

$\int\frac{1}{1+e^{-2x}}dx$

Calcular la integral

$\int x^2e^{2x+1}dx$

Calcular la integral

$\int x\left(x^2-3\right)dx$

Calcular la integral

$\int x^2e^xdx$

Calcular la integral

$\int16xe^{4x}dx$