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11th Class Mathematics Sample Paper Maths Olympiad Model Paper-9

  • question_answer
    If \[x+\frac{1}{x}=2\cos \theta ,\] then \[{{x}^{n}}+\frac{1}{{{x}^{n}}}\] is equal to.

    A)  \[2\cos \,n\,\theta \]

    B)  \[2\sin \,n\,\theta \]

    C)  \[\cos \,n\,\theta \]                     

    D)  \[\sin \,n\,\theta \]

    E)  None of these

    Correct Answer: A

    Solution :

     Not Available               


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