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  3. 12th Class
  4. Mathematics

12th Class Mathematics Sample Paper Mathematics Olympiad Sample Paper-1

  • question_answer
    If\[f(x)=co{{t}^{-1}}\left( \frac{{{x}^{x}}-{{x}^{-x}}}{2} \right)\],then \[f'(1)=\]

    A)  \[-\log 2\]

    B)         \[\log 2\]         

    C)  1                    

    D)  -1

    Correct Answer: D

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