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  3. 11th Class
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11th Class Mathematics Sample Paper Mathematics Sample Paper-1

  • question_answer
    The real value of \[\alpha \] for which the expression \[\frac{1-i\sin \alpha }{1+2i\sin \alpha }\]  is purely real is, where n \[\in \]N

    A)  \[(n+1)\frac{\pi }{2}\]  

    B)  \[(2n+1)\frac{\pi }{2}\]

    C)  \[n\pi \]            

    D)  None of these

    Correct Answer: C

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