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Diberikan matriks $A=\\begin{bmatrix} 1&\\var{a} &\\var{b}\\\\ 0&1&\\var{b}\\\\0&0&1 \\end{bmatrix}$. Perhatikan bahwa $A\\cdot A^T=I$.

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Pernyataan berikut yang benar adalah $\\ldots$.

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