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If the two tangents to the curve y=ax^(3...

If the two tangents to the curve `y=ax^(3)-2x-1` at the poits `x=1 and x=3` are both parallel to X- axes , then: a=

A

` pm 2`

B

`(4)/(3), (4)/(27)`

C

`(2)/(3), (2)/(27)`

D

`1, 3`

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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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