$\lim_{x\to\frac{\pi}{2}}\left(\frac{\pi}{2}-x\right)$
$6u^9y^{-6}y^6.2x^6.3ux^{-9}$
$6x^2-x+222$
$\frac{d}{dx}\left(2-x^2\right)^x$
$\frac{\left(1+x\right)}{x}=x-1$
$72\cdot\frac{1}{3}\cdot2$
$8^2-8x$
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