$\frac{d^4}{dx^4}\left(\left(15x^3+3x-4\right)\left(5x-2\right)\right)$
$\left(4a^3-2b\right)\left(a-3b^2\right)$
$\lim_{x\to3}\frac{x^2-9}{\left(x+3\right)\left(2x+1\right)}$
$9x^{2}y^{4}+\frac{9}{36}z^{6}+xy^{2}z^{3}$
$b^2-2b^2-b^2$
$\lim_{x\to3}\left(4x-5\right)^2$
$\int x.e^{-5x}dx$
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