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  • 1. Mixed Topic - Quiz


    1. A square matrix A said to be orthogonal, if A A = AA = In.
    If A and B are orthogonal matrices of the same size, which one of the following is an orthogonal matrix?
    a) A + B
    b) A + iB
    c) i(A + B)
    d) AB

    2. The value of $\int e^{x} . \frac{x^{2} + 1}{\left (a + 1 \right )^{2}}dx$ is
    a) $e^{x}\left (\frac{x - 1}{x + 1} \right ) + c$
    b) $e^{x}\left (\frac{x + 1}{x - 1} \right ) + c$
    c) $e^{x}.x + c$
    d) None of these