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The Fourier series expansion of the saw-toothed waveform f(x) = x...

This question belongs to Engineering Maths Transform Theory
Transform Theory
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The Fourier series expansion of the saw-toothed waveform f(x) = x in (-π, π) of period 2π gives the series, $$1 - \frac{1}{3} + \frac{1}{5} - \frac{1}{7} + \,....$$
The sum is equal to

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Correct Answer: Option D
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