Question
Find the slope of the line whose inclination is $\frac{\pi}{4}$
$\therefore$ Slope of the line $=\tan \theta=\tan \frac{\pi}{4}=1$
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$\left[\begin{array}{ll}6 & 0 \\ 0 & 6\end{array}\right]$
$\left[\begin{array}{ccc}0 & 4 & 7 \\ -4 & 0 & -3 \\ -7 & 3 & 0\end{array}\right]$