Find the integral $\int\frac{c}{e^{bx}\left(a+e^{-bx}\right)^n}dx$

Find the integral

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

Find the integral

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

Find the integral

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

Find the integral

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

Find the integral

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

Find the integral

$\int x^2e^xdx$

Find the integral

$\int16xe^{4x}dx$