$\left(+18\right):\left(-3\right)-\left(-8\right)$

$\left(-60xy^2+9x\right)^2$

$\frac{dy}{dt}=y\left(6t-1\right)$

$\frac{d}{dx}\left(\frac{\left(3x^2+1\right)^4}{\left(2x-1\right)^3}\right)$

$\lim_{x\to\infty}\left(3xe^{3x}\right)$

$\frac{dy}{dx}=\frac{y^{3}}{x^{2}}$

$-2\cdot1-3$