$sec\left(x\right)\sin\left(x+y\right)$
$2y^2+11y$
$\frac{x^2+x+1}{x^3-3x^2}$
$\lim_{r\to0}\left(\frac{\ln\left(r^2\right)}{r^{-2}}\right)$
$n\cdot exp\left(-a\cdot n\right)$
$\left(-3\right)^2+1$
$\left(4a^2\:-3d\right)^2$
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