arctandx=_____________.

admin2019-11-25  35

问题 arctandx=_____________.

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答案[*](x2-1)arctan[*]+C

解析 xarctandxarctantdt=arctantd(t4)
t4arctant-dt=t4arctant-dt
t4arctant-(t2-1+)dt
t4arctant-(t3-t+arctant)+C
(x2-1)arctan+C
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