设函数f(x)=arctanx,求=( )
y′=x-1,y′′=-1!x-2, y′′′=2!x-3,…. y(n)= (-1)n-1(n-1)!x-n
已知函数,则f(x)在点x=0处()
所以,f(x)在点x=0处间断,答案为B.
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