$-4n-n$
$\frac{d}{dx}\left(4+9x\right)^x$
$6mn+5mn$
$\left(1\right)-\left(-1\right)-\left(-1\right)$
$\int\:\frac{100}{36+25x^2}dx$
$\lim_{x\to0}\left(arctan2x\right)^{sin2x}$
$\left(2x+3y\right)+\left(4x+y\right)$
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