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If f(x)=2cos^-1x+4cot^-1x-3x^2-2x+10 the...

If `f(x)=2cos^-1x+4cot^-1x-3x^2-2x+10` the range of `f(x)` is `[a,b]` then the value of `4a-b` is

A

11

B

`11-pi`

C

`11+pi`

D

`15-pi`

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