smileREGENT: 答案把arccos(3/5)约等于 (53*大饼节红包数π /180)了
所以最后结果是个近似结果
dynthia: 精确结果是不是 32/5 - 8*arcsin(3/5)?
dynthia: 您是怎么算的,我是直接列积分
tianxq888: 六年级学三角函数了吗?
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