Multiple Choice Questions on What is cos2 beta cos2y equal to ........ for NDA Exam Preparation

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Multiple Choice Questions

What is cos2 beta cos2y equal to ........

Mathematics (NDA) Vector
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    Consider the following for the next two (02 items) that follow:

    Let a vector a = 4î - 8 j + k make angles a, β, y with the positive directons of x,y,z axes respectively.

    What is cos2β + cos2y equal to ? 

    This questions was previously asked in
    2023 NDA -1 Math
    View All NDA Previous Year Papers

    -\frac{32}{81}

    Correct Answer

    -\frac{16}{81}

    Incorrect Answer

    \frac{16}{81}

    Incorrect Answer

    \frac{32}{81}

    Incorrect Answer
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    Explanation:

    -\frac{32}{81}

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