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

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

    A)            \[\frac{x}{2y-1}\]

    B)            \[\frac{x}{2y+1}\]

    C)            \[\frac{1}{x(2y-1)}\]

    D)            \[\frac{1}{x(1-2y)}\]

    Correct Answer: C

    Solution :

               \[y=\sqrt{\log x+y}\Rightarrow {{y}^{2}}=\log x+y\]            \[\Rightarrow 2y\frac{dy}{dx}=\frac{1}{x}+\frac{dy}{dx}\Rightarrow \frac{dy}{dx}=\frac{1}{x(2y-1)}\]


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