$\frac{f^2-1}{f+1}$
$x^2+24x+143$
$9x^2-25=\left(3x+5y\right)\left(3x-5y\right)$
$\left(2x^3+3x^2+5x-3\right)\left(2x^2+x-3\right)$
$4\left(1x-3\right)+2$
$\left(7x-xy\right)^2$
$\int\left(\frac{\left(x^2+10x\right)}{x+5}\right)dx$
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