$2^3\cdot2^{-3}$
$\left(x+1\right)^2\left(x-3\right)^2-2x^2+4x$
$\left(a^3+b\right)^2$
$b+169=421$
$b^2\left(28b^4-29b^2+6\right)$
$x^2-5x+4$
$\frac{d}{dx}x+11$
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