$cos\left(tan^{-1}\left(3x\right)\right)$
$\frac{d}{dx}\left(\sec\left(xy\right)\ln\left(x^y\right)=5\right)$
$3^2-4$
$\left(0.3x-0.2y\right)\left(0.3x+0.2y\right)$
$\frac{\left(-3\right)^{n+1}}{4^{n-1}}$
$1\cdot9$
$\left(3x-6y-2z\right)^2$
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