hello,

f is a function from [a,b] to .

We suppose :

1) Show that f is the function null from .

I think that we must use Taylor's inegalities which say that (I don't know if it's the same name ...) :

for

where M majors from [a,b].

so, here, we have:

for

howerver we can take

and

so we have:

...

and I have no idea to keep on the demonstration.

thanks

do you understand what I said ?