Find \( \frac{d y}{d x} \), when
\( \mathrm{P} \)
\[
x=\frac{2 t}{1...
Find \( \frac{d y}{d x} \), when
\( \mathrm{P} \)
\[
x=\frac{2 t}{1+t^{2}} \text { and } y=\frac{1-t^{2}}{1+t^{2}}
\]
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