Ononot — Every square matrix can be uniquely decomposed as A = S + K

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Matriceshard

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Every square matrix can be uniquely decomposed as $A = S + K$ where $S = \frac{A + A^T}{2}$ (symmetric) and $K = \frac{A - A^T}{2}$ (skew-symmetric). If $A = \begin{pmatrix} 3 & 2 \\ 1 & 5 \end{pmatrix}$ , what is the symmetric part $S$ ?