function  z=d2fnv3p5(t,y);
%% derivative with respect to t of the function f(t,y(t)) found in
%% Burden and Faires Chap 5 Sect 3 problem 5
z=4*(t.^(-3)).*y -4*(t.^(-2)).*fnv3p5(t,y)+2*(t.^(-1)).*dfnv3p5(t,y)+(t.^2+4*t+2).*exp(t);
