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10th Class Mathematics Sample Paper Maths Olympiad Model Test Paper-11

  • question_answer
    If \[\sin \alpha +{{\sin }^{2}}\alpha +{{\sin }^{3}}\alpha =1,\] then the value of \[{{\cos }^{6}}\alpha -4{{\cos }^{4}}\alpha +8{{\cos }^{2}}\alpha \] is:

    A)  2                                

    B)  4

    C)  \[-\,2\]                         

    D)  0

    E)  None of these

    Correct Answer: B

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