$\lim_{x\to+\infty}\:\frac{\ln\left(x+e^x\right)}{x^2}$

$1351+-128$

$\left(ku-3w\right)\left(ku+3w\right)$

$\int_0^5\left(4x\right)dx$

$\int\left(2x\:+\:1\right)\:\left(x\:-\:9\:\right)^{\frac{1}{2}}dx$

$\frac{1^2-x^2}{1-x}$

$\int_0^{\infty}\left(\frac{\cos\left(x\right)}{2x}\right)dx$