The principal value of the expression ...

The principal value of the expression : `cos^(-1) [ cos (-680^(@))] ` is :

A

`pi/4`

B

`pi/2`

C

`(3pi)/4`

D

`(2pi)/9`

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The correct Answer is:

D

The principal value of the expression : cos^(-1) [ cos (-680^(@))]...
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