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The matrix $A=\begin{bmatrix}2 & 0 &0 \\0 & -1 & 0\\0 & 0 & 2\end{bmatrix}$ then $A^{-1}$ is equal to : |
$\begin{bmatrix}1 & 0 &0 \\0 & -1 & 0\\0 & 0 & 2\end{bmatrix}$ $\begin{bmatrix}\frac{1}{2} & 0 &0 \\0 & -\frac{1}{6} & 0\\0 & 0 & \frac{1}{2}\end{bmatrix}$ $\begin{bmatrix}\frac{1}{2} & 0 &0 \\0 & -1 & 0\\0 & 0 & \frac{1}{3}\end{bmatrix}$ $\begin{bmatrix}1 & 0 &0 \\0 & 2 & 0\\0 & 0 & -3\end{bmatrix}$ |
$\begin{bmatrix}\frac{1}{2} & 0 &0 \\0 & -1 & 0\\0 & 0 & \frac{1}{3}\end{bmatrix}$ |
