differentiation

Question: If $x = \frac{{1 - {t^2}}}{{1 + {t^2}}}$and $y = \frac{{2t}}{{1 + {t^2}}}$, then $\frac{{dy}}{{dx}} = $



1) $\frac{{ - y}}{x}$
2) $\frac{y}{x}$
3) $\frac{{ - x}}{y}$
4) $\frac{x}{y}$
Solution: Explanation: Explanation
Implicit-function

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