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

If `f(x)=x^3+4x^2+lambdax+1` is a monotonically decreasing function of `x` in the largest possible interval `(-2,-2/3)dot` Then `lambda=4` (b) `lambda=2` `lambda=-1` (d) `lambda` has no real value

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