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並前往https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:trig/x2ec2f6f830c9fb89:radians/v/introduction-to-radians

Intro to radians (video) | Trigonometry | Khan Academy

If you were to go 180 degrees, you'd essentially form a straight line. ... Well, the most obvious one, if you kind ...

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