$\left(x^3+x^2y+5xy^2-2y^3\right)+\left(-3x^2y-6xy^2+8y^3\right)$
$\lim_{x\to-1}\left(\frac{x^3+3x^2+3x+1}{x^2-1}\right)$
$12y^{3-18y^2}$
$4\sqrt{4^2+9}$
$\left(5-3i\right)+\left(9+5i\right)$
$5+\left(-4+4\cdot5+\left(10\right)\right)+\left(-4\right)$
$-9x-2y$
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