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GATE Electronics & Communication · Engineering Mathematics - Linear Algebra - Matrices · 2023-2023

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2023 Q38

Let $\mathbf{x}$ be an $n \times 1$ real column vector with length $l = \sqrt{\mathbf{x}^T\mathbf{x}}$. The trace of the matrix $P = \mathbf{x}\mathbf{x}^T$ is

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