1.

The value of `cot^(-1)(-1)+cosec^(-1)-sqrt(2)+sec^(-1)(2)` isA. `(5pi)/(6)`B. `(2pi)/(3)`C. `(7pi)/(6)`D. `(pi)/(6)`

Answer» `cot^(-1)(-1)+cosec^(-1)(-sqrt(2))+sec^(-1)(2)`
`=(3pi)/(4)-(pi)/(4)+(pi)/(3)=(5pi)/(6)`


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