# Matrix Theory - Isometries

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Find the eigenvalues and eigenvectors of A.

See attached file for full problem description.

Consider the matrices in O(2) of the form:

;

these matrices correspond to the elements of O(2) with det(A)= -1. Find the eigenvalues and eigenvectors of A.

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##### Solution Summary

This shows how to find eigenvalues and eigenvectors.

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I will use t instead of theta, it is easier to write; to find the eigenvalues we need to solve Det(A-xI)=0, which means:

(cost-x)(-cost-x)-sint*sint=0 so:

x^2=1 (using that the cos^2+sin^2=1).

So x1=1 and x2=-1 are the eigenvalues.

In what follows we will assume sint non-zero. If sint is zero, we discuss in the end of the proof what the answer is.

Eigenvectors for ...

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