The fourier series of the periodic function ƒ(t) shown

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The fourier series of the periodic function ƒ(t) shown in the figure below has coefficients a_k, b_k. The series has

1. both cosine and sine terms but only for odd values of k
2. only cosine terms for odd values of k
3. only sine terms for odd values of k
4. a constant and sine terms for odd values of k

Correct Option: C

NA