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f(x)=80-25x^(3)+3x is increasing in...

`f(x)=80-25x^(3)+3x` is increasing in

A

R

B

`((1)/(5), infty)`

C

`(- infty, -(1)/(5))`

D

`(-(1)/(5), (1)/(5))`

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