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## Homework Statement

I'm trying to show that a given matrix is the inverse of the other, by showing that multiplying them together generates the identity matrix. I can't see a way to simplify the last step and I feel like I'm missing something..? Any input on this would be helpful. Thanks!

## Homework Equations

see below

j = sqrt(-1)

## The Attempt at a Solution

How do I prove that the rest of the terms are 0?