JEE Main & Advanced Mathematics Differentiation Question Bank Differentiation of implicit function Parametric

  • question_answer
    If \[y=\sqrt{x+\sqrt{x+\sqrt{x+........\text{to}}}}\infty \,,\,\text{then}\frac{dy}{dx}=\]   [RPET 2002]

    A)            \[\frac{x}{2y-1}\]

    B)            \[\frac{2}{2y-1}\]

    C)            \[\frac{-1}{2y-1}\]

    D)            \[\frac{1}{2y-1}\]

    Correct Answer: D

    Solution :

               \[y=\sqrt{x+\sqrt{x+\sqrt{x+......\infty }}}\] Þ \[y=\sqrt{x+y}\]            Þ  \[\frac{{{\partial }^{2}}u}{\partial {{y}^{2}}}=\frac{1}{u}-\frac{{{(y-b)}^{2}}}{{{u}^{3}}}\] Þ  \[2y\frac{dy}{dx}=1+\frac{dy}{dx}\]            Þ  \[\frac{dy}{dx}(2y-1)=1\] Þ \[\frac{dy}{dx}=\frac{1}{2y-1}\].


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