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

If z = `sec^(-1) (x + 1/x) + sec^(-1) (y + 1/y)`, where xy< 0, then the possible value 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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