$cos\left(x\right)=0.4$
$\frac{d}{dx}x^3e^{x-2}$
$cos\left(cos^{-1}\left(3x\right)\right)$
$2^7\cdot2^{-2}$
$\frac{x^{3}-4x^{2}+3x-2}{x+2}$
$2\left(0\right)^3$
$3b+-8b^2$
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