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

let `f(x)=(x^2-1)^n (x^2+x-1) ` then `f(x)` has local minimum at `x=1` when

A

n=2

B

n=3

C

n=4

D

n=5

Text Solution

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The correct Answer is:
A, C
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