5. Find the Fourier series of the given function \( f(x) \), which is assumed to have the period \( 2\pi \), where \( f(x) = x + \pi \) for \( -\pi < x < \pi \). (10%)
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5. Find the Fourier series of the given function \( f(x) \), which is assumed to have the period \( 2\pi \), where \( f(x) = x + \pi \) for \( -\pi < x < \pi \). (10%)