If z = sec^(-1) (x + (1)/(x)) + sec^(-1)...

If `z = sec^(-1) (x + (1)/(x)) + sec^(-1) (y + (1)/(y))`, where `xy lt 0`, then the possible values of z is (are)

A

`(8pi)/(10)`

B

`(7pi)/(10)`

C

`(9pi)/(10)`

D

`(21pi)/(20)`

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The correct Answer is:

A, B, C

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