Can some1 please help me with

Attachment 9815

Thanks

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- Jan 25th 2009, 01:32 PMnerdoMatrix proof 3
Can some1 please help me with

Attachment 9815

Thanks - Jan 25th 2009, 02:14 PMPaulRS
Note that: $\displaystyle

\left( {\text{Id} + A} \right) \cdot \left( {\text{Id} - A} \right) = \text{Id} - A^2 = \text{Id}

$ (Wink)