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Let f(lamda)(x)=4lamda x^3-8lamda x^2 +3...

Let `f_(lamda)(x)=4lamda x^3-8lamda x^2 +36x+48` be a real function . If `lamda^ast` is the greatest integeral value of `lamda` for which `f_(lamda)(x)` is increasing function then value of `f_(lamda).(1)+f_(lamda).(-1)` is equal to

A

0

B

1

C

-1

D

2

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