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11.3 FOURIER COSINE AND SINE SERIES
www.personal.psu.edu(ii) The Fourier series of an odd function on the interval (p, p) is the sine series (4) where (5) EXAMPLE 1 Expansion in a Sine Series Expand f(x) x, 2 x 2 in a Fourier series. SOLUTION Inspection of Figure 11.3.3 shows that the given function is odd on the interval ( 2, 2), and so we expand f in a sine series. With the identification 2p 4 we have p 2. Thus (5), after integration …