$\sqrt{a}^2+x^2$
$cosx+sinxtanx+secx$
$6x-8x^5$
$\sqrt{9^4}$
$\lim_{x\to0}\left(\frac{\frac{1}{2}-\cos\left(\frac{\pi}{3}-x\right)}{x}\right)$
$\left(6-x\right)\left(x^{2\:}-9\right)$
$108-18x$
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