$-2065\cdot7$
$x-x^{-1}=1$
$f\left(x\right)=\left(x^2+1\right)^6$
$\frac{r^2s^{-3}}{3s^2}\cdot\frac{s^2}{r^{-4}}$
$\sqrt{x^2+2\left(x^2-1\right)+6}$
$\frac{12^{-2}}{2^{-2}}$
$xt+1=2xt-5$
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