$1a^2-9n^2-6an$
$\frac{\left(9c^3+6c^2+30\right)}{\left(3c+9\right)}$
$0.436\:-\:\frac{9}{89}$
$\frac{1}{x^4-3x^2-4}$
$2\pi\:\int_{-3}^3\:\left(4-x\right)\left(\frac{x^2}{3}-\left(x^2-6\right)\right)dx$
$\frac{5}{4}x^3-\frac{3}{5}x^3+5x^3$
$\frac{4x^3+x^2-4}{x-1}$
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