$x^2\:y^'=1-x^2+y^2-x^2\:y^2\:$
$x+7+2x$
$\frac{ab^{3}}{ab^{3}}$
$21e\cdot7e$
$\frac{-2\infty+1}{-\infty+1}$
$\lim_{x\to1}\left(\frac{1}{x^{x-1}}\right)$
$\frac{3}{2x-8}+\frac{1}{4-x}=\frac{1}{2}$
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