$14\cdot8.50$

$\left(\frac{dy}{dx}=y^2\left(4-y^2\right)\right)$

$\left(2-5i\right)^3$

$-\left(x\:\:t\:\:\:y\right)-2\left(-3x-3y\right)\:t\:y\left(x-3\right)-\left(-3y\right)\:\:t\:x\left(y-1\right)$

$\lim_{z\to\infty}\left(\ln z\right)^{\frac{1}{z}}$

$-9a^4-3-12a^2$

$\tan^{-1}\left(\sin\left(\frac{\pi}{6}\right)\right)$