% This is a Matlab function m-file called by the matlab
% script euler.m.  It contains a few functions of t
% as defined below.  
function yrhs=feuler(t,y)  
%%%yrhs=y+5*cos(5*t)*exp(t);
%%%yrhs=1/((1+t^2))-2*y^2;
yrhs=-30*y^4;