$\lim_{x\to\infty}\frac{1}{x^2-z-1}$
$2x-xy-3xy$
$\left(1+x^2\right)\left(y\right)^'+4xy=\left(1+x^2\right)^{-2}$
$6\cdot0.5$
$\frac{3x+2}{6}-x=-\frac{2x+1}{3}$
$\sqrt{4x}^4-12x^2y+9x^2$
$x^2-x-200$
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