Question: Show that the Fourier expansion of cos ax is 2a sinan | 1 cos.x cos 2x cos ax 2a2 a2 - 12 a 22


Show that the Fourier expansion of cos ax is 2a sinan |

Show that the Fourier expansion of cos ax is 2a sinan | 1 cos.x cos 2x cos ax 2a2 a2 - 12 a 22 2a sinan an = (-1)". T (a? n)

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