Proving Matrix Rotation: Homework Question & Attempted Solution

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SUMMARY

The discussion focuses on proving that a matrix A represents a rotation about the origin. Participants suggest using mathematical induction as a method for proof, indicating that the property of rotation can be established through the relationship A^2 and the expression A^{2n} = (A^2)^n. This approach simplifies the proof process and highlights the inherent properties of rotation matrices.

PREREQUISITES
  • Understanding of matrix operations and properties
  • Familiarity with rotation matrices in linear algebra
  • Knowledge of mathematical induction as a proof technique
  • Basic concepts of eigenvalues and eigenvectors
NEXT STEPS
  • Study the properties of rotation matrices in 2D and 3D spaces
  • Learn about mathematical induction and its applications in proofs
  • Explore the derivation of rotation matrices from trigonometric functions
  • Investigate eigenvalues and eigenvectors related to rotation matrices
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Students studying linear algebra, educators teaching matrix theory, and anyone interested in mathematical proofs involving matrix transformations.

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Homework Statement



Untitled.png


Homework Equations





The Attempt at a Solution



I understand that matrix in the form of A as above represents a rotation about the origin.. but for this question, I am actually clueless on what method should i use to prove it... Any hint?
 
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Michael_Light said:

Homework Statement



View attachment 56742

Homework Equations





The Attempt at a Solution



I understand that matrix in the form of A as above represents a rotation about the origin.. but for this question, I am actually clueless on what method should i use to prove it... Any hint?

Seems like a natural for an induction proof.
 
It looks to me to be almost trivial! What is A^2? A^{2n}= (A^2)^n.
 

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