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为什么反三角函数的前缀是 arc？arc 的意思是什么？ - 知乎 When measuring in radians, an angle of θ radians will correspond to an arc whose length is rθ, where r is the radius of the circle Thus, in the unit circle, "the arc whose cosine is x" is the same as "the angle whose cosine is x", because the length of the arc of the circle in radii is the same as the measurement of the angle in radians