Find the derivative $y^{\text{'}}(x)$ implicitly.

$13.xcos(x+y)-y^2\sqrt[\phantom{2}]{x+y}=8x$

$14\mathrm{.}3cscx-4sin{y}^3-\frac{4y}{x+2}=10x^2$

$15.e^{4y}-ln(y^2+3)=si{n}^{5}4x$

$16.e^{x^2}y-3\sqrt[\phantom{2}]{x+y}-tan{y}^2=8$