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The exponential Fourier co-efficient of a function f(t), whose trigonometric Fourier expansion is found to contain only con sine terms, are—
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- always pure imaginary
- always real numbers
- partly real and partly imaginary
- None of these
Correct Option: B
The exponential Fourier coefficients of a function f(t), whose trigonometric Fourier expansion is found to contain only cosine, are always real number.
