$-12\cdot60$
$34\cdot47$
$x^2+\:2xy$
$\int\left(\frac{\left(t+1\right)^2}{t^2}\right)dx$
$8x^2a-20x^3a^3+4a$
$\lim_{x\to\infty}\left(\frac{x+3}{x}\right)$
$\frac{4x-2}{2x+1}$
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