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12th Class Mathematics Sample Paper Mathematics Olympiad - Sample Paper-4

  • question_answer
    If \[co{{s}^{-1}}\,p+co{{s}^{-1}}q+co{{s}^{-1}}r=\pi \], then \[{{p}^{2}}+{{q}^{2}}\]\[+\,{{r}^{2}}+2pqr\]is equal to

    A)  3                    

    B)  1            

    C)  2                    

    D)  - 1

    Correct Answer: B

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