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In the app folder, you can see a set of 4 files. The first file is the keygen for the latest Autocad 2013. 1) In Autocad, click File > New, then click Graphic > Pantone PANTONE Colors. 2) Choose a color, then click OK. 3) Save the file to any location that you like. 4) In Autocad, you can see the Pantone color that you choose in the graphic. In the Edit menu, you can export the file, and then import the file. 5) Click File > Export, and save the file to any location. 6) In the export file, in the exported file’s path of edit, replace the name of your Autocad file. 7) Click File > Import, and open the exported file. 8) You can see the Pantone color that you imported in Autocad. Q: Inverse of the matrix of a function We have a matrix equation $$A \varphi = y$$. Now I’m trying to write $A^{ -1}$, using that $A^{ -1}$ has to be a matrix such that $$\varphi=A^{ -1} y$$, but I’m getting myself confused, since the variable is the same. I have $A=\begin{pmatrix} 2 & 0 & 0 \\ 0 & 1 & 1 \\ 0 & 0 & 2\end{pmatrix}$, and $y=\begin{pmatrix} 4 & 3 & 1\end{pmatrix}^T$. So $$\begin{pmatrix} 2 & 0 & 0 \\ 0 & 1 & 1 \\ 0 & 0 & 2\end{pmatrix}\begin{pmatrix} \varphi_1 \\ \varphi_2 \\ \varphi_3\end{pmatrix} = \begin{pmatrix} 4 & 3 & 1\end{pmatrix}^T.$$ How do I proceed? I’m used to invert matrices in «front of» the variable, not in the middle of the equation. A: The given matrix $A$ is invertible. Therefore, there exists a unique matrix $P$ such that $A P=I$. We can easily show this by computing the null