Let f(x) = a 1 sin x + a 2 sin 2x + +
Question:
Let f(x) = a1 sin x + a2 sin 2x + ∙ ∙ ∙ + an sin nx, where a1, a2 , . . . , an are real numbers and n is a positive integer. If it is given that |f(x)| ≤ |sin x| for all x, show that
|a1 + 2a2 + ∙ ∙ ∙ + nan | ≤ 1
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Related Book For
Calculus Early Transcendentals
ISBN: 9781337613927
9th Edition
Authors: James Stewart, Daniel K. Clegg, Saleem Watson, Lothar Redlin
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