arctan(1/1-x)左右极限怎么求?x=1或者-1时arctan(1/1-x)左右极限怎么求?x=1或者-1时

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arctan(1/1-x)左右极限怎么求?x=1或者-1时arctan(1/1-x)左右极限怎么求?x=1或者-1时
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arctan(1/1-x)左右极限怎么求?x=1或者-1时arctan(1/1-x)左右极限怎么求?x=1或者-1时
arctan(1/1-x)左右极限怎么求?x=1或者-1时
arctan(1/1-x)左右极限怎么求?
x=1或者-1时

arctan(1/1-x)左右极限怎么求?x=1或者-1时arctan(1/1-x)左右极限怎么求?x=1或者-1时
看符号
arctan(正无穷大)=二分之派
arctan(负无穷大)=负二分之派
x->1+ arctan(1/(1-x))=arctan(负无穷大)=负二分之派
x->1- arctan(1/(1-x))=arctan(正无穷大)=二分之派
x->-1 arctan(1/(1-x))=arctan(1/2)