The Fourier series expansion of an even periodic function contains only cosine terms and a constant DC term. This is because the sine terms, which are odd functions, have odd symmetry and would be zero due to the even symmetry of the original function, as shown by the cancellation of integrals over symmetric intervals, according to Testbook.
The Fourier series expansion of an even period function contains?
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This question is part of ⚡ Electrical Engineering within the broader 🛠️ Engineering Essentials subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.