$\lim_{x\to0}\left(\frac{7x\left(cos\left(2x\right)\right)-1}{sin\left(8x\right)-8x}\right)$
$\frac{x^3-x^2+2x+6}{x-3}$
$\left(x^{20}-y^{20}\right)$
$x^2+7x+10>0$
$12^9\cdot12^{-7}$
$sec^3xcos^2x\:$
$\lim_{x\to infinity}\left(\frac{ln\left(x\right)}{x^{-1}}\right)$
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