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y=4x^(3)-42x^(2)+144x+8 decreasing in...

`y=4x^(3)-42x^(2)+144x+8` decreasing in

A

`phi`

B

R

C

`(3, 4)`

D

`(- infty, 3) uu (4, infty)`

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The correct Answer is:
C
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MARVEL PUBLICATION-APLICATIONS OF DERIVATIVES-MULTIPLE CHOICE QUESTIONS (TEST YOUR GRASP - II : CHAPTER 12)
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