$4x^2-1-x^2-3x^2+6x-2$
$\frac{\left(5m+3n\right)^2+\left(5n+3m\right)^2}{m^2+n^2}$
$\int\frac{x}{\left(4+9x\right)^2}dx$
$\frac{x^5-x^48+x^2-2}{x^2+1}$
$\left(r-\frac{1}{r}\right)^2$
$2.\:\left(x\:+3\right)\:=\:x\:-\:6\:\:\:\:$
$\left(20x+40\right)e^{x^2+4x}$
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