$\frac{5x^4-3x^3-\frac{21}{5}x-15}{5x+2}$
$\int\frac{x+4}{x^2-7x-8}dx$
$\frac{120}{-24}$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{4\cos\left(-5x\right)}{cos\left(7x\right)}\right)$
$8\left(145\right)$
$\lim_{x\to\infty}\left(x\log\left(x\right)\right)$
$\frac{1-3x^2+4x\sqrt{x}}{2\sqrt{x}\left(x^2+1\right)^2}$
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