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並前往https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:trig/x9e81a4f98389efdf:inverse-trig/v/inverse-trig-functions-arctan

Intro to arctangent (video) | Trigonometry | Khan Academy

Sal introduces arctangent, which is the inverse function of tangent, ... So x could be anywhere between minus infinity and positive infinity. x could pretty ...

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