$u-3,7<-9,6$
$7n^2+n^2$
$\arctan\left(\frac{-1+1}{-1-1}\right)+\arctan\left(\frac{-1-1}{2}\right)$
$\frac{3x^3+2x-1}{x+2}$
$\left(+64\right)-\left(-20\right)$
$\sqrt{\left(x-7\right)^3}$
$tan^2x+\sec^2x+2tanx$
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