$\frac{dx}{dy}=\frac{x^3+x}{\left(y^3+2y^2+y\right)\left(x-1\right)}$

$cx^5+bx^4+ax^3$

$\left(3a-2\right)\left(a+1\right)$

$\lim_{x\to-\infty}\left(\frac{\sqrt{4x^2+1}}{1-x}\right)$

$\left(13a^2b^4-10ab^2-1\right)\left(13a^2b^4-10ab^2+1\right)$

$\frac{d}{dx}\left(2xy^3-x^2y=y^2-3x-\arctan\left(\sin\left(2xy\right)\right)\right)$

$m-1\cdot m-2$