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cot^-1(1)+3sin^-1(1/2)-cosec^-1(-2)-3tan...

`cot^-1(1)+3sin^-1(1/2)-cosec^-1(-2)-3tan^-1(1/sqrt3)`=_________

A

`pi/12`

B

`(5pi)/12`

C

`(7pi)/12`

D

`pi/4`

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