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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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