If the function f(x)=3 cos |x| -6 ax +b ...

If the function f(x)=3 cos |x| -6 ax +b increases for all `x in R` then the range of value of a given by

A

`agt-1/2`

B

`alt-1/2`

C

`aleb`

D

`ageb`

Verified by Experts

The correct Answer is:

B

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