The value of sec690^(@) is :...

The value of sec`690^(@)` is :

A

`(sqrt(3))/(2)`

B

`-(sqrt(3))/(2)`

C

`(2)/(sqrt(3))`

D

`-(2)/(sqrt(3))`

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The correct Answer is:

C

The value ……….
`sec690^(@)= sec(720^(@)-30^(@))= sec(-30^(@))=sec30^(@) = (2)/(sqrt(3))`

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