$\lim_{x\to0}\left(\frac{x.2^x}{2^x-1}\right)$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{\tan\left(x\right)}{x-\frac{\pi}{2}}\right)$
$-92-12$
$x^4+6x^3-x^2-6x$
$\frac{d}{dx}\left(y^2-2xy=a^2\right)$
$1521x^2-7921$
$-3x-7$
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