$7\left(-2x\:-\:3\right)$
$2r^3\:\cdot r$
$\frac{\left(sin\left(x\right)-1\right)}{cos\left(x\right)}-\frac{\left(cos\left(x\right)\right)}{sinx-1}$
$e^{x^2}=140$
$2x+1\:+\:2x-1\:are$
$cos\left(3x^2+3\right)$
$\frac{dy}{dx}=6y^2x$
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