$\frac{90}{9}$
$x-15-5x$
$17.63+\left(-28.862\right)$
$\frac{d}{dx}x\arcsec\left(x\right)$
$1-\frac{-\sin\:^2\left(x\right)}{1+\cos\left(x\right)}=\cos\left(x\right)$
$x^2+8x-125$
$\int\frac{4x+7}{\left(x^2+2x+1\right)}dx$
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