$\int\frac{35}{x^2\sqrt{x^2+81}}dx$
$\frac{ds}{dt}=\frac{\left(2t+1\right)\left(2s-1\right)}{2t^2+2t}$
$\int\left(1+\tan\left(x\right)\right)\:dx$
$f\left(x\right)=\frac{x^2-1}{x^3-x}$
$-10+2-6-8$
$2a\:+\:\left[a-\left(a+b\right)\right]$
$\left(4x-7\right)^3$
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