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x=(1-t^(2))/(1+t^(2)), y=(2t)/(1+t^(2)) ...

`x=(1-t^(2))/(1+t^(2)), y=(2t)/(1+t^(2)) " then " (dy)/(dx)` is

A

`y/x`

B

`(-y)/x`

C

`- x/y`

D

`x/y`

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