 Square root of a 2 by 2 matrix (source code)

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= Square root of a 2 by 2 matrix
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The square root of a 2x2 matrix \\( A \\) is a matrix \\( B \\) such that \\( B^2 = A \\). Finding the square root of a matrix can be a more complex operation than finding the square root of a scalar number, and not every matrix has a square root.

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