$\int\frac{ln\left(t\right)}{t^7}dt$
$\left(\frac{1}{2}x-2\right)\left(\frac{1}{2}x+2\right)$
$\frac{d^4}{dx^4}\:\left(sen\:x\:+\:cos\:x\right)$
$\lim\:_{x\to\:\infty\:}\left(\frac{x^2-2x+3}{x-1}+ax+b\right)$
$-12\:\left\{-\:7\:+\:\left[\:-\:4\:\left(\:-\:2\:-\:3\:\right)\:+\:5\:-\:\left(\:-\:10\:-\:2\right)\right]\:+\:15\right\}$
$\frac{3x^4-6x^2-x}{x}$
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