JEE Main & Advanced Mathematics Indefinite Integrals Question Bank Fundamental Integration

  • question_answer
    If \[\int_{{}}^{{}}{\frac{f(x)\ dx}{\log \sin x}=\log \log \sin x}\], then \[f(x)=\]

    A)            \[\sin x\]

    B)            \[\cos x\]

    C)            \[\log \sin x\]

    D)            \[\cot x\]

    Correct Answer: D

    Solution :

               \[\int_{{}}^{{}}{\frac{f(x)\,dx}{\log \sin x}}=\log \log \sin x\]            Differentiating both sides, we get            \[\frac{f(x)}{\log \sin x}=\frac{\cot x}{\log \sin x}\Rightarrow f(x)=\cot x.\]


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