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  3. 12th Class
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12th Class Mathematics Sample Paper Mathematics Olympiad - Sample Paper-2

  • question_answer
    \[co{{s}^{-1}}(cos(2\,{{\cot }^{-1}}(\sqrt{2}-1)))\]is equal to ___.

    A) \[\sqrt{2}-1\]     

    B)  \[\frac{\pi }{4}\]

    C)  \[\frac{3\pi }{4}\]         

    D)  None of these

    Correct Answer: C

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