Differential Calculus

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Question : 65 of 69

Marks: +1, -0

If

x=\;{2 t}/{1+t^{2}}, y=\;{1-t^{2}}/{1+t^{2}}

then

\;{d y}/{d x}+\;{x}/{y}

is

1
2
0
$4 t^{2}$

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