Value of : cos^(-1) ((-1)/2) -2 sin^(-1)...

Value of : `cos^(-1) ((-1)/2) -2 sin^(-1) (1/2) + 3 cos^(-1) (-1/sqrt2)-4 tan^(-1) (-1)` equals :

`pi/12`

`(43pi)/12`

`(7pi)/4`

`(11pi)/4`

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The correct Answer is:

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