$\lim_{x\to0}\left(\frac{1}{log\left(1+x\right)}-\frac{1}{x}\right)$
$\left(\frac{1}{3}a-3b\right)\left(\frac{1}{9}a^2+ab+ab^2\right)$
$\left(z^2-4\right)\left(z^2+5\right)$
$8x^2-12x-8$
$f\left(x\right)=\ln\left(x+3x^2\right)^3$
$\log_{10}\left(x+5\right)+\log_{10}\left(x-5\right)$
$5\left(x+y\right)+2\left(x+\right)$
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