[理工] [工數]-Fourier series
1.
Find the Fourier series of &(x) in -L < x < L
^^^ = =
ㄉㄟ 歐 塔
答案是
1 8 1 n(pi)x
---- + M ---cos------
2L n=1 L L
這提 f(x) 是多少阿@@
我還是沒辦法舉一反三..
2.
Find the Fourier series f(x) = xsinx in -pi < x < pi
這題型我第一次看到 有 sin... 所有題目為一一題..
我算到
1 pi
---- S xsinxcosnx dx 就不知道如何下去了 @@
pi -pi
3.
4
f(x) = x + cos3x + x + 5 for -pi < x < pi
以傅立業 表示 成
1 8 n(pi)x n(pi)x
---a0 + M [ an cos-------- + bn sin------- ]
2 n=1 L L
求 b5
2
答案是 ---
5
--
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