The principal values of `cost^(-1)(-sin(7pi)/(6))` isA. `(5pi)/(3)`B. `(7pi)/(6)`C. `(pi)/(3)`D. none of these

The principal values of `cost^(-1)(-sin(7pi)/(6))` isA. `(5pi)/(3)`B.

1.	The principal values of `cost^(-1)(-sin(7pi)/(6))` isA. `(5pi)/(3)`B. `(7pi)/(6)`C. `(pi)/(3)`D. none of these
Answer» Correct Answer - C `cos^(-1)(-sin.(7pi)/(6))=cos^(-1)(-sin(pi+(pi)/(6)))` `=cos^(-1)(sin.(pi)/(6))` `=cos^(-1)((1)/(2))=(pi)/(3)`

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