$\frac{2.449489742783178+2\cdot2^3}{\left(3\right)\left(16-8+1\right)}$
$90a^2+39a-42$
$\int\cot^3\frac{x}{3}dx$
$5\left(-\frac{1}{5}\right)\:-2$
$\frac{x^3}{2x^2-7}$
$15x^2-36x$
$\lim_{y\to0}\left(\frac{2x^3-xy-y^3}{x^2-y^2}\right)$
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