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7 . a. Show that on (-7, 7), sin (a) sin(2x) sin (3x) x = 2 + ... ). 1 2 3 b. Use the

7 . a. Show that on (-7, 7), sin (a) sin(2x) sin (3x) x = 2 + ... ). 1 2 3 b. Use the result of part a of this problem to derive the Fourier cosine series for f (x) = x2 on - TT

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