Mathematics, 13.06.2020 19:57 KillerSteamcar
The vector (3, -7) is rotated by an angle of 3pi/4 radians and then reflected across the y-axis.
If the resulting vector is (a/b), then a =
and b =
Answers: 2
and 
.![\vec R = \left[\begin{array}{ccc}\cos \theta&\ -\sin \theta\\ \sin \theta&\cos \theta\end{array}\right] \left[\begin{array}{ccc}3\\-7\end{array}\right]](/tpl/images/0685/3094/c591f.png)
![\vec R = \left[\begin{array}{ccc}3\cdot \cos \theta + 7 \cdot \sin \theta\\ 3\cdot \sin \theta - 7 \cdot \cos \theta\end{array}\right]](/tpl/images/0685/3094/8fd2b.png)
![\vec R = \left[\begin{array}{ccc} 2\sqrt{2}\\ 5\sqrt{2}\end{array}\right]](/tpl/images/0685/3094/281d8.png)
. Then, 
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The vector (3, -7) is rotated by an angle of 3pi/4 radians and then reflected across the y-axis.
If...
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