$if\:y=sin\:x$
$3mn+m+2mn$
$\:78d+23d-32d+12f+5f+21d$
$4x-\left(xc+5x-7\right)+6-\left(-4+3xc\right)$
$\frac{dy}{dx}=7-\frac{y}{400}$
$\left(-\frac{2}{3}\right)-\left(-\frac{35}{3}\right)$
$arccos\left(cos\left(x\right)\right)=\frac{2\pi}{3}$
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