$xy\cdot xy$
$\lim_{x\to-\infty\:}\left(\frac{x^2+x}{\left(x^2+3\right)^2}\right)$
$4y^2\:-\:x^8$
$4\cos\left(4x\right)=3$
$\int\frac{2x-1}{x^2-5x+6}dx$
$\frac{2+\sqrt{-12}}{2}$
$\frac{1}{7}a-\frac{3}{14}a+\frac{5}{28}a$
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