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  3. 11th Class
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11th Class Mathematics Sample Paper Maths Olympiad Model Paper-2

  • question_answer
    If \[\sqrt{x}+\frac{1}{\sqrt{x}}=2\cos \theta ,\] then \[{{x}^{6}}+{{x}^{-6}}=\]

    A) \[2\sin 3\theta \]             

    B)  \[2\cos 3\theta \]

    C) \[2\cos 6\theta \]            

    D)  \[2\cos 12\theta \]

    E)  None of these

    Correct Answer: D

    Solution :

     Not Available


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