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  3. 12th Class
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12th Class Mathematics Sample Paper Maths Olympiad Model Paper-1

  • question_answer
    If \[f(x)=\cos (\text{In}\,x),\] then \[f(x).f(y)-\frac{1}{2}\left[ f\left( \frac{x}{y} \right)+f(xy) \right]\] has the value:

    A)  \[-1\]                           

    B)  \[\frac{1}{2}\]

    C)  \[-2\]                           

    D)  0

    E)  None of these

    Correct Answer: D

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