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If f(x)=x^3+4x^2+ax+5 is a monotonically...

If `f(x)=x^3+4x^2+ax+5` is a monotonically decreasing function of x in the largest possible interval `(-2,-2//3), then the value of a is

A

`lambda = 4`

B

`lambda = 2`

C

` lambda = -1`

D

`lambda` has no real value

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A
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