How to Prove that a Matrix is Orthogonal

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In this video I will teach you what an orthogonal matrix is and I will run through a fully worked example showing you how to prove that a matrix is Orthogonal and thus has orthonormal vectors
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You're the only video that explained this in a simple way so thank youuu

malyourgal
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You are the only person who successfully put this into my brain

CensoredMercy
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Why is this true though? Why is it orthogonal if it equals the identity matrix?

sgracem