The value of cos^(-1) (-1) + tan^(-1)...

The value of ` cos^(-1) (-1) + tan^(-1) (oo ) + sin ^(-1) 1=……`

A

`-pi`

B

`(3pi)/2`

C

`30^(@)`

D

`2pi`

Verified by Experts

The correct Answer is:

D

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