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f(x+T)= f(x) for all x.

We say that f is a periodic function with a period T>0.

Use an appropriate substitution to prove that for all real numbers a

[tex]\int^{a+T}_{a}f(x)dx[/tex] = [tex]\int^{T}_{0}f(x)dx[/tex].

I have no idea how to do this question.

thanks for helping me!