6. Let T: R³ R³ be the orthogonal projection onto the line spanned by ( 1 15 Find a basis for which this projection matrix is diagonal, that is, the only nonzero entries occur in the (1,1), (2,2), and (3,3) entries.

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6. \( \frac{1}{15} \) Let \( T : \mathbb{R}^3 \to \mathbb{R}^3 \) be the orthogonal projection onto the line spanned by 
\[
\begin{pmatrix} 
1 \\ 
1 \\ 
1 
\end{pmatrix}
\].
Find a basis for which this projection matrix is diagonal, that is, the only nonzero entries occur in the (1,1), (2,2), and (3,3) entries.
Transcribed Image Text:6. \( \frac{1}{15} \) Let \( T : \mathbb{R}^3 \to \mathbb{R}^3 \) be the orthogonal projection onto the line spanned by \[ \begin{pmatrix} 1 \\ 1 \\ 1 \end{pmatrix} \]. Find a basis for which this projection matrix is diagonal, that is, the only nonzero entries occur in the (1,1), (2,2), and (3,3) entries.
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