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12th Class Mathematics Sample Paper Mathematics Olympiad - Sample Paper-5

  • question_answer
    If \[(sin\,x)\,(cos\,y)=\frac{1}{2}\], then \[\frac{{{d}^{2}}y}{d{{x}^{2}}}\] at \[\left( \frac{\pi }{4},\frac{\pi }{4} \right)\] is

    A)  - 6           

    B)  - 4           

    C)  0                    

    D)  - 2

    Correct Answer: B

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