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

  • question_answer
    The value of  \[\cos \,\,\frac{\pi }{11}+\cos \,\,\frac{3\pi }{11}+\cos \,\,\frac{5\pi }{11}+\cos \,\,\frac{7\pi }{11}+\cos \,\,\frac{9\pi }{11}\] is

    A)  1                                

    B)  \[\frac{1}{2}\]

    C)  2                                

    D)  \[\frac{1}{4}\]                                              

    E)  None of these

    Correct Answer: B

    Solution :

     Not Available


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