$\frac{x-1}{x+1}-\frac{3+x}{x-1}$
$\int\frac{4x-1}{\left(x^2+4\right)\left(x-4\right)}dx$
$2x^9+4x^5+2x$
$\left(115\right)\::\:\left(-\:5\right)\:$
$5a\left(3b^2+6c^5-d^2\right)$
$\frac{dy}{dx}=\frac{x\cdot y}{x^2-1}$
$x^2+9x+2=0$
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