$81=x^2+12x+36$
$9x^4-y^2$
$b^2-18b+81$
$\frac{4r^2}{7r^3}$
$2x^3+7x^2+7x+2$
$\lim_{x\to-\infty}\left(\frac{\left(2x-1\right)}{\sqrt{3x^2+x+1}}\right)$
$sin\:\frac{x}{2}cos\:\frac{x}{2}=\:\frac{sinx}{2}\:$
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