$18.4+18-\left(-2\right).11$

$\frac{\left(\sec\left(x\right)\right)^2}{x\tan\left(x\right)}$

$7-\left|11-\left(7-13\right)\right|$

$\int tan^9\left(x\right)\times sec^{12}\left(x\right)dx$

$\int x\left(\sqrt{x^2+1}\right)\ln\left(\sqrt{x^2-1}\right)dx$

$+32-\left(-7\right)+\left(-32\right)-\left(-32\right)+\left(+42\right)$

$\left(-21\right)+\left(32\right)+\left(+19\right)+\left(+47\right)+\left(-10\right)$