$\int\frac{lnx}{x\cdot sqrt\left(1+\left(lnx\right)^2\right)}dx$

$\lim_{x\to0}\left(\frac{x+\tan\left(x\right)}{5+\sin\left(x\right)}\right)$

$114r^2s^6-120r^3s^7+25r^4s^8$

$\left(30\cdot0\right):\left(\left(-2\right)\cdot3\right)$

$-x^4\left(x\right)-x^4\left(2x^5\right)$

$2\sqrt{40}$

$x\:-\:17\:=\:12$