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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 在 @王大锤 的提点下，去搜索了英文维基，果然有解释。 Etymology of the arc- prefix 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
ARC connected but no audio (resolved!) | AVS Forum Hey everyone, I'm trying to hook up my TV and receiver via HDMI ARC, but I'm struggling to get the TV audio on my surroundspeakers TV: LG OLED55BX6LB Receiver: Denon AVR-X1300W HDMI cable connected from TV's HDMI ARC port to receiver's HDMI ACR port Temporarily disconnected all other