Find the integral $\int3\left(x^2+2\right)^{-\frac{1}{2}}xe^{\left(\sqrt{x^2+2}\right)}dx$

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

$\int x^2e^xdx$

Find the integral

$\int\left(\frac{\cos\left(x\right)}{x}\right)dx$

Find the integral

$\int\frac{cos\left(x\right)}{x}dx$

Find the integral

$\int16xe^{4x}dx$