$-8+7-\left(3+4-9\right)$
$3-3x^2+6+3x+1+4x+2x$
$\left(\cos^2\left(x\right)+\frac{1}{\tan^2\left(x\right)}\right)\cdot\frac{1}{\csc^2\left(x\right)}$
$\int-\frac{9}{2}dx$
$\frac{dy}{dx}=xy+3y-x-3$
$-6\:+\:2\:.\:-6\:+\:5\::\:-\:1\:$
$3m+2n+5m-10+7n$
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