Engineering Board Exam Reviewer · Fourier Series · medium
Find a1 in the Fourier series of f(x)=|x| on (-π,π).
- 1.27
- -0.64
- -1.27
- 0
Answer
C. -1.27
Solution
a1= 1π -ππ|x| x,dx= 2π 0π x x,dx= 2π [x x+ x ]0π= 2π(-1-1)=- 4π -1.27.
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