$\lim_{x\to0}\left(3x\right)^{7x}$
$\frac{1}{1-\sec\left(a\right)}+\frac{1}{1+\sec\left(a\right)}=2\cot^2\left(a\right)$
$-\frac{3}{5}x=9$
$3\frac{dy}{dx}=\frac{y}{4}$
$5\:2\:3-3\:3\:2$
$\frac{1}{\left(x+6\right)^2}$
$\frac{6}{6yx}$
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