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Here the Fourier series is given by

\(\displaystyle f(x)=\frac{1}{2}a_0+\sum_{n=1}^{\inf}a_n cos nx dx\) where \(\displaystyle a_n=\frac{2}{\pi}\int_0^\pi f(x)cos nx dx\)

I am facing problem to solve it. I am getting \(\displaystyle a_0=0\) and \(\displaystyle a_n=0\) so the Fourier series becomes identically zero.