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Let f(x)=(x^2-1)^n(x^2+x+1) then f(x) ha...

Let `f(x)=(x^2-1)^n(x^2+x+1)` then `f(x)` has local extremum at `x=1` when `n=2` (b) `n=3` (c) 4 (d) `n=6`

A

n=2

B

n=3

C

n=4

D

n=6

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A, C, D
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