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

If ` x = (1-t^(2))/(1+t^(2))` and `y = (2t)/(1+t^(2))`then dy/dx =

A

(-x/y)

B

x/y

C

(-y/x)

D

y/x

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The correct Answer is:
A
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