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Thread: Matrix proof 3

  1. January 25th 2009, 01:32 PM #1
    nerdo
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    Matrix proof 3

    Can some1 please help me with

    Matrix proof 3-untitled.jpg


    Thanks
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  2. January 25th 2009, 02:14 PM #2
    PaulRS
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    Note that: <br /> \left( {\text{Id} + A} \right) \cdot \left( {\text{Id} - A} \right) = \text{Id} - A^2 = \text{Id}<br />
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