$-9x^2+4y^2+36z^2+36x-8y-72z+4=0$
$x-6-\left(\frac{1}{3}\right)x$
$\frac{x^2+2x-15}{x^3-1}$
$\frac{3x^3}{6x^5}$
$\sqrt[3]{27w^{21}}$
$\int_{x^2}^{\sqrt{6-x^2}}dx$
$-tan\left(\frac{\pi}{2}\right)cos^2\left(\frac{\pi}{2}\right)$
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