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11th Class Mathematics Sample Paper Maths Olympiad Model Test Paper-10

  • question_answer
    \[\cos \frac{\pi }{7}+\cos \frac{3\pi }{7}+\cos \frac{5\pi }{7}\] equals to _______.

    A)  1                                

    B)  \[\frac{1}{\sqrt{2}}\]

    C)  \[\frac{1}{2}\] 

    D)  \[\frac{1}{4}\]

    E)  None of these

    Correct Answer: C

    Solution :

     Not Available               


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