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並前往https://www.mathworks.com/matlabcentral/answers/245716-what-is-the-initial-phase-of-the-signal-y-sin-2-pi-x-zero-or

what is the initial phase of the signal y=sin(2*pi*x)? zero or

But when i use fft to calculate the initial phase , i got the result is -90. The matlab code is as follows. I want to know why the two result is different.thank ...

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