Show that for a continuous parameter (theta) the set of matrices forms a one-parameter abelian Lie group

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Show that for a continuous parameter \(\theta\) the set of matrices

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forms a one-parameter abelian Lie group under matrix multiplication, and that if the matrices \(G\) operate on a 2D cartesian space \(\left(x_{1}, x_{2}\right)\) they leave \(x_{1}^{2}+x_{2}^{2}\) invariant.

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