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If x=(1-t^(2))/(1+t^(2))" and "y=(2t)/(1...

If `x=(1-t^(2))/(1+t^(2))" and "y=(2t)/(1+t^(2))," then: "(dy)/(dx)|_(t=1)` is

A

`(1)/(2)`

B

1

C

0

D

2

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