$ln\left(y\right)=ln\:\left(\frac{a}{b}\right)$
$\frac{1}{2^{x-1}}$
$4d+-8d+9+-2$
$16v^2-40v+25$
$\frac{\left(20r^{-2}s^{-3}t^{-4}\right)\left(2r^2s^2t^{-5}\right)}{\left(-4r^{-3}st^2\right)\left(3rs^{-4}t^{-2}\right)}$
$\frac{s^2+4s+6}{s\left(s+1\right)\left(s^2+4s+6\right)}$
$\left(x-3\right)^2+6\left(x-1\right)x^2$
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