参考:
https://zhuanlan.zhihu.com/p/41875010
https://zhuanlan.zhihu.com/p/108598607
https://www.leiphone.com/category/yanxishe/HJWOsm2lCtCIpVVK.html
https://www.geogebra.org/download
Original: https://www.cnblogs.com/lhx9527/p/15933591.html
Author: 365/24/60
Title: 《乱码篇》-傅里叶变换推导
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