I don't understand this:
Prove the identity without evaluating the determinants.
It's a question at the end of a section of properties of determinant functions, but I don't know how to do it
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See here for a very similar thread. Columns versus rows makes little difference to a determinant.
Thank you! I get it now.
You're welcome. Have a good one!
The determinant on the left is the sum of three determinants two of which have identical columns and are therefore zero.
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