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The poins of extremum of phi(x)=underse...

The poins of extremum of `phi(x)=underset(1)overset(x)inte^(-t^(2)//2) (1-t^(2))dt` are

A

`f` has maximum at `x=0`

B

`f` has maximum at `x=-1`

C

`f` has maximum at `x=-1`

D

`f` has no critical point

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The correct Answer is:
B
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