$\left(\frac{x^2-9}{x^2-3}\right)$
$4x^4.x^7$
$\int\frac{x}{\sqrt{9-x^2}\:}dx$
$\int\frac{8x-64}{x^2\left(x^2+64\right)}dx$
$\left(-4x-5\right)^3$
$\lim_{x\to\frac{\pi}{-2}}\left(\frac{sec\left(x\right)-1}{tan\left(x\right)}\right)$
$4x-6$
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