Let f and f be piecewise continuous on [L, L]. Use Bessels
Chapter 13, Problem 13.36(choose chapter or problem)
Let f and f be piecewise continuous on [L, L]. Use Bessels inequality to show that lim n L L f (x) cos nx L dx = lim n L L f (x)sin nx L dx = 0. This result is called Riemanns lemma.
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