$\left(m+3\right)+\left(m-3\right)$
$\left(x^2y^9\right)^{-9}$
$\lim\:_{x\to\:5}\left(8x^2-37x-15\right)$
$20+490+51$
$sin\left(-\frac{\pi}{2}\right)$
$4y''-4y'-15y=0$
$-625-15625$
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