@Preben Alsholm sir, do you mean when i type this code in maple i willl get my result an dplot the graph?

@Preben Alsholm Thank you for this sir, I was using maple 13 and i wasnt getting any results when i put in the commands. Please do you know any site that i could get the Maple 18 or Maple 2015. 

@Preben Alsholm Thank you sir, i am writing my project on delay differential equations, using Block BDF.

i need the solutions before the end of next week sir.

i saw you on 

Mathematics Genealogy Project

I will like you to help me out sir. Thank you sir.

@Markiyan Hirnyk thanks, but it is a delay differential equation.

please write a program on matlab or maple for this dde

y'(x)=-y(x-pi/2)       0<x<=10

y(x)=sin(x)       x<=0

tau=pi/2