There are some things wrong in the following demonstration. Find the mistakes and correct them.
In this exercise we attempt to obtain the Fourier cosine coefficients of ex:
Since Equations (3.4.22) and (3.4.23) give the Fourier cosine series of ex, they must be identical. Thus,
By correcting the mistakes, you should be able to obtain A0 and An without using the typical technique, that is,
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