$$\frac { \sec t ^ { 2 } y ^ { 2 } } { x ^ { 3 } + 4 }$$
$\frac{1}{\left(x^{3}+4\right)\cos(\left(ty\right)^{2})}$
$-\frac{3\times \left(\frac{x}{x^{3}+4}\right)^{2}}{\cos(\left(ty\right)^{2})}$
