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  3. please do 9maybe you need information about 7do not prove...

Question: please do 9maybe you need information about 7do not prove...

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7. If A and B are n × n matrices such that AB BA, show that eAe-e* 8. Combine Exercises 4 and 7 and the definition (4.3) to find e* where A - 1 01 L0 01 9. Show that (e). (Hin: See Exercise 7.) 10. Show that det eM * 0, for any M. (Hin: exe-X-l, by Exercise 9)

Please do #9,maybe you need information about #7(do not prove #7), thank you

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