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`sin^(-1)(-(1/2))+cos^(-1)(-(1/2))+cot^(-1)(-sqrt3)+cosec^(-1)(sqrt2)+tan^(-1)(-1)+sec^(-1)(sqrt2)` equals

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`sin^(-1)(-(1/2))+cos^(-1)(-(1/2))+cot^(-1)(-sqrt3)+cosec^(-1)(sqrt2)+tan^(-1)(-1)+sec^(-1)(sqrt2)` equals
A. `(9pi)/4`
B. `(19pi)/12`
C. `(3pi)/2`
D. `pi/2`
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Correct Answer - B
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