$\frac{6-57x+2x^3+5x^2}{x-4}$
$\lim_{x\to\infty}\left(-\frac{\pi^{x-1}}{4\cdot12^{x-1}}\right)$
$2\left(2m-1\right)-8m$
$10-4.2$
$6\left(8v\right)$
$10x^2\:x\:7x^3$
$\frac{\sec\left(a\right)+\csc\left(a\right)}{1+\tan\left(a\right)}$
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