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Cos^(-1) ( 4x ^(3) - 3x ) =a + b cos ^...

`Cos^(-1) ( 4x ^(3) - 3x ) =a + b cos ^(-1)x ` is a equation of trigonomatric inverse circular function .
If ` x in [-(1)/(2),-1]` then the value of ` a +bpi ` is -

A

`2pi `

B

`3pi`

C

`pi`

D

`-2pi`

Text Solution

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The correct Answer is:
C
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