The error function prove

[vtnsx]

Here's the question... i really dont know how to prove this question
http://members.shaw.ca/brian103/theerrorfunction.jpg

[Astronuc]

a)

\int_a^b f(x)\,dx = \int_0^b f(x)\,dx - \int_0^a f(x)\,dx

b) I think you just subsitute in the function y and y' and show the equation is satisfied.