Chapter 14.2, Problem 37E

$\begin{array}{l}37.\text{ If }f(x,y)=\frac{2x}{x^2+y^2},\text{ find the folowing}\text{.}\\ \text{(a) }{\frac{{\partial }^{2}f}{\partial x^2}|}_{(-1,4)}\text{ (b) }{\frac{{\partial }^{2}f}{\partial y^2}|}_{(-1,4)}\end{array}$