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If x=t-1/t, and y=t+1/t," then the value...

If `x=t-1/t, and y=t+1/t," then the value of "(dy)/(dx)" at "t=2` is

A

`(3)/(5)`

B

`-(3)/(5)`

C

`(5)/(3)`

D

`(5)/(4)`

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