$\lim_{x\to2}\left(\frac{x-2}{\sqrt{x}-2}\right)$
$\int2\sec\left(3x-9\right)\tan\left(3x-9\right)dx$
$arccos\left(sin\left(\frac{\pi}{2}\right)\right)$
$\sqrt{x-4=12}$
$\left(6x^2-w^2x\right)\left(6x^2+w^2x\right)$
$2\sin^2\left(y\right)-\sin\left(y\right)-1=0$
$ln4x^5y^6$
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