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Range of f(x)=cos^(- 1)x+2sin^(- 1)x+3ta...

Range of `f(x)=cos^(- 1)x+2sin^(- 1)x+3tan^(- 1)x` is

A

`[-(3pi)/4,(7pi)/4]`

B

`[-(5pi)/2,(7pi)/2]`

C

`[-(3pi)/2,(5pi)/2]`

D

none of these

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The correct Answer is:
A
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