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![21.
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find the Fourier series
fing Fourier series of q21
T](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F67c0ac62-1b35-4b64-a173-03ad498854d6%2F823b6db3-ec73-4e22-af97-3a6493411988%2Fj921vef_processed.jpeg&w=3840&q=75)
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