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The values of lambda for which the func...

The values of `lambda` for which the function `f(x)=lambdax^3-2lambdax^2+(lambda+1)x+3lambda` is increasing through out number line (a)`lambda in (-3,3)` (b) `lambda in (-3,0)` (c)`lambda in (0,3)` (d) `lambda in (1,3)`

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