$\lim_{x\to0}\left(\frac{tanx}{\sqrt{x}}\right)$
$\tan\left(30\right)+\cos\left(30\right)^2+\tan\left(60\right)$
$-\left(281+5341\right)$
$m\:-\:9\:+-13$
$\log_{3x}\left(2x+1\right)=1$
$3a+7-5a^2-a$
$\frac{dy}{dx}=\frac{2x}{\cos\left(y\right)}$
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