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並前往https://www.reddit.com/r/learnmath/comments/mp8j1z/trigonometry_why_is_arctantan3pi_0/

[Trigonometry] Why is arctan(tan(3pi)) = 0? - Reddit

But so does tangent of 0. So, arctan gives us the input to a tangent function that would equal zero. Which is zero, and pi. And 2pi. And 3pi..

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