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Find trace [[10,-9,-12],[7,-12,11],[-10,10,3]]

Solution:
Your problem `->` trace [[10,-9,-12],[7,-12,11],[-10,10,3]]


`trace(A)` = 
`trace`
`10``-9``-12`
`7``-12``11`
`-10``10``3`


`=10+(-12)+3`

`=1`







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