9.7 Change of bases examples I - Linear Algebra and Analytic Geometry

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We discuss again the example of axial (i.e. reflection) symmetry in R^2 covered in lectures 9.3 and 9.5. This time we apply the Change of Bases Theorem to derive the expression of such homomorphisms in coordinates. More specifically, the reflection axis is determined by its angle with the coordinate x-axis and such is the only parameter appearing in the homomorphism expression.
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