$\lim_{x\to\infty}\left(x\:\left(e^{\frac{-s}{x}}-1\right)\right)$

$\frac { ( 3 ) - 2 } { 3 \cdot ( 3 - 3 ) }$

$\frac{-x-8x^2}{\left(3x-1\right)\left(2x+1\right)}$

$-5+-4\frac{d^7}{dx^6}\left(4\right)$

$\left(\tan\left(x-1\right)\right)\left(\sqrt{3}\tan\left(+1\right)\right)=0$

$2x^2-y=5$

$\left(1-x\right)\frac{dy}{dx}=y^2$