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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

`x=1,-1`

B

`x=-1,2`

C

`x=2,1`

D

`x=-2,1`

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A
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