Find the acute angle of intersection of the planes $x = 0$ and $9x - y + z - 7 = 0$ to the nearest degree. $\theta \approx$
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Step 1: The normal vectors of the planes are $\begin{pmatrix} 1 \\ 0 \\ 0 \end{pmatrix}$ and $\begin{pmatrix} 9 \\ -1 \\ 1 \end{pmatrix}$. Show more…
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