$\frac{1}{2\:}x\:-\frac{2}{3}+\frac{1}{3\:}-\frac{1}{4}x$
$\left(-2\right).\left[\left(-3\right)\right]+\left(-18\right):\left(+9\right)$
$x^3-4x^2+4x+9$
$\int\frac{2x+3}{x^2+9x+8}dx$
$b^2\:-\:625$
$\lim_{x\to-8}\left(\frac{x^3-216}{x^3+10x^2+8x-64}\right)$
$\frac{\csc\left(t-1\right)}{\cot\left(t\right)}$
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