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If f(x)=x^(3)+4x^(2)+lambdax+1 is a mon...

If `f(x)=x^(3)+4x^(2)+lambdax+1` is a monotonically decreasing function of x in the largest possible interval `(-2,-2//3)` . Then

A

`lambda=4`

B

`lambda=2`

C

`lambda=-1`

D

`lambda` has no real value

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The correct Answer is:
A
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