Answers: 3
![[\sigma_{ij}]=\left[\begin{array}{ccc}10&12&13\\\12&11&15\\13&15&20\end{array}\right]](/tpl/images/0709/9134/95a55.png)
![\left[\begin{array}{c}t_1^{R}&t_2^{R}&t_3^{R}\\ \end{array}\right] =\left[\begin{array}{ccc}10&12&13\\\12&11&15\\13&15&20\end{array}\right] \left[\begin{array}{c}\frac{1}{\sqrt{2}}&0&\frac{1}{\sqrt{2}}\\ \end{array}\right]](/tpl/images/0709/9134/00d3f.png)
![=\frac{1}{\sqrt{2}}\left[\begin{array}{ccc}10\times 1&+12 \times 0&+ 13 \times 1\\12\times 1&+11\times 0&15\times 1\\13\times 1&+15\times 0&+20\times 1\end{array}\right] \\\\\\\\=\frac{1}{\sqrt{2}}\left[\begin{array}{c}23&27&33\\ \end{array}\right] \\\\](/tpl/images/0709/9134/cfed4.png)
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