$\left(5a-7b\right)\left(a+3b\right)$
$\left(2x-9y\right)^2$
$12r^2+36rs+27s^2$
$f\left(x\right)=\ln\left(\frac{3+x}{3-x}\right)$
$-27-11+16+57+15-31$
$\left(4ax+1\right)^2$
$\lim_{x\to0}\left(\frac{xe^{-x}}{1+2x-\cos\left(x^2\right)}\right)$
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