$4x^2y^4-24x^3y^3+36x^4y^2$
$x-3y+2=4$
$\sin\left(2x\right)\cos\left(y\right)-\cos\left(2x\right)\sin\left(y\right)$
$\left(2x^3+3x^2\right)\left(x-1\right)$
$\left(\frac{3^{-1}ab^{-9}}{5^{-1}a^{-3}b-12c}\right)$
$\frac{1+b^2}{1+b}$
$-h^2-4k^2-4hk$
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