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## Homework Statement

Suppose f is a periodic function of period 2pi and that g is a horizontal shift of f, say

g(x) = f(x + a). Show that f and g have the same energy.

## Homework Equations

n/a

## The Attempt at a Solution

i can see that if f(x) is shifted by 'a' that it does not make the function any difference.

but in not sure how should i go about showing it.

could someone help me out pls.

BA