JEE Main & Advanced Mathematics Differentiation Question Bank Derivative at a point Standard Differentiation

  • question_answer
    If\[y={{\log }_{10}}{{x}^{2}}\], then \[\frac{dy}{dx}\]  is equal to

    A)  \[\frac{2}{x}\]

    B)   \[\frac{2}{x{{\log }_{e}}10}\]

    C)  \[\frac{1}{x{{\log }_{e}}10}\]

    D)   \[\frac{1}{10x}\]

    Correct Answer: B

    Solution :

               Given \[y={{\log }_{10}}{{x}^{2}}\]                    \[y=\frac{{{\log }_{e}}{{x}^{2}}}{{{\log }_{e}}10}\],   \[\left( \because {{\log }_{a}}b=\frac{{{\log }_{e}}b}{{{\log }_{e}}a} \right)\]                    \[y=\frac{2{{\log }_{e}}x}{{{\log }_{e}}10}\],  \[\therefore \frac{dy}{dx}=\frac{2}{x{{\log }_{e}}10}\].   


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