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

  • question_answer
    If \[x=cos\text{ }\alpha +cos\text{ }\beta -cos\text{ (}\alpha +\beta \text{)}\] and \[y=4\]sin , \[\frac{\alpha }{2}Sin\,\frac{\beta }{2}\cos \left( \frac{\alpha +\beta }{2} \right)\] then (x - y) is equal to

    A)  1                    

    B)  -1            

    C)  2                    

    D)  10

    Correct Answer: A

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