$\frac{-1-2x}{x}$
$\lim_{x\to1}\left(\frac{x^7-1}{x^{28}-1}\right)$
$\lim_{x\to\infty}\left(\frac{2x^2+1}{x^2+x}\right)$
$0y\frac{1}{2}$
$81w^2+36w+4$
$4\cos\left(d\right)^2=3$
$ax-ay-az-5ax-7ay-6az4ax+9ay+8az$
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