$\lim_{x\to0}\left(\frac{\tan\left(a+x\right)-\tan\left(a\right)}{x}\right)$
$2\left(7\right)-7$
$\sqrt{\left(x+a\right)}\left(y-b\right)$
$x^2-2x+0$
$y=xy\:\frac{dx}{dy}$
$x^9+2x^2-x-2$
$1\cdot2x$
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