2arcsiny/2与arcsiny的关系.例如,在某个圆中,圆心角为A,半径为R,A对应的弦长为L.则,sinA=L/R,sinA/2=L/2R.arcsinL/R=A,arcsinL/2R=A/2.2arcsinL/2R=arcsinL/R,应该对啊.可为什么2*arcsin1/2=60°,arcsin1=90°.
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![2arcsiny/2与arcsiny的关系.例如,在某个圆中,圆心角为A,半径为R,A对应的弦长为L.则,sinA=L/R,sinA/2=L/2R.arcsinL/R=A,arcsinL/2R=A/2.2arcsinL/2R=arcsinL/R,应该对啊.可为什么2*arcsin1/2=60°,arcsin1=90°.](/uploads/image/z/13429661-5-1.jpg?t=2arcsiny%2F2%E4%B8%8Earcsiny%E7%9A%84%E5%85%B3%E7%B3%BB.%E4%BE%8B%E5%A6%82%2C%E5%9C%A8%E6%9F%90%E4%B8%AA%E5%9C%86%E4%B8%AD%2C%E5%9C%86%E5%BF%83%E8%A7%92%E4%B8%BAA%2C%E5%8D%8A%E5%BE%84%E4%B8%BAR%2CA%E5%AF%B9%E5%BA%94%E7%9A%84%E5%BC%A6%E9%95%BF%E4%B8%BAL.%E5%88%99%2CsinA%3DL%2FR%2CsinA%2F2%3DL%2F2R.arcsinL%2FR%3DA%2CarcsinL%2F2R%3DA%2F2.2arcsinL%2F2R%3DarcsinL%2FR%2C%E5%BA%94%E8%AF%A5%E5%AF%B9%E5%95%8A.%E5%8F%AF%E4%B8%BA%E4%BB%80%E4%B9%882%2Aarcsin1%2F2%3D60%C2%B0%2Carcsin1%3D90%C2%B0.)
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