If sec^(-1)x=cosec^(-1) y then cos^(-1)(...

If `sec^(-1)x=cosec^(-1) y` then `cos^(-1)(1)/(x)+cos^(-1)(1)/(y)`=

A

`pi`

B

`pi/4`

C

`(-pi)/(2)`

D

`pi/2`

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The correct Answer is:

D

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