$\lim_{x\to1}\left(\frac{x^{17}-1}{x^{27}-1}\right)$
$\lim_{x\to\:0}\:\left(2x^3\right)$
$2541+-217$
$x^2y^2+2x^2y+y^2$
$\frac{dx}{da}5x-3$
$4x^3+9x^2-x-6$
$\left(3^{-6}\right)^{-5}$
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