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Any help is appreciated!

Quote: Originally Posted by DarK Any help is appreciated! $\displaystyle I+A^2=0\Longrightarrow A^2=-I\Longrightarrow \det A^2=\det(-I)=1$ (why?), and since $\displaystyle \det A^2 = \left(\det A\right)^2$ then $\displaystyle \det A=$ ... Tonio