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I want to know why every real function has negative frequency component. If I am not correct, can anyone tell me how it is really?

I heard that it is related to Fourier analysis, though not sure.

By the way, I am a high schooler graduating next year. I understand introductory calculus (calculus I, II, III in university level), so I do not think there will be any problem for me to understand explanation.

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    Google `Herm$i$tian symmetry` of Fourier transform of real functions2012-10-10

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