$m^4-3m^2+4\cdot3m^3-2m+1$
$7+9y-3y$
$\sqrt[3]{\frac{y}{2}}\:$
$4k^2-20k+25$
$\cos\left(4a\right)=1-8\sin\left(a\right)^2+8\sin\left(a\right)^4$
$\frac{d^2}{d^2x}\left(x^2y^2-2x=1\right)$
$4x+3-9+2x$
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