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@@ -68,7 +68,7 @@ It is easy to show that any product of cosines and sines can be expressed as the
As a final test to see if the Fourier series really could exist for any periodic function, we consider a periodic function with a sharp peak as shown below
-![Peak Function Image](/peak_func.gif)
+![*Peak Function Image*](/peak_func.gif)
If it is possible to approximate the above function using a sum of sines and cosines, then it can be argued that *any* continuous periodic function can be expressed in a similar way. This is because any function could be expressed as a number of peaks at every position.