Question
Determine the type of transformation represented by the following matrix. \( \left[\begin{array}{cc}\cos \left(-29^{\circ}\right) & -\sin \left(-29^{\circ}\right) \\ \sin \left(-29^{\circ}\right) & \cos \left(-29^{\circ}\right)\end{array}\right] \) Rotation: \( \begin{array}{l}v \text { Select } \\ \text { Clockwise } \\ \text { Counterclockwise }\end{array} \)
Ask by Curry Flynn. in the United States
Mar 20,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
The transformation is a clockwise rotation by 29 degrees.
Solution
We start with the given matrix:
\[
\begin{bmatrix}
\cos(-29^\circ) & -\sin(-29^\circ) \\
\sin(-29^\circ) & \cos(-29^\circ)
\end{bmatrix}
\]
1. The standard rotation matrix by an angle \(\theta\) is:
\[
\begin{bmatrix}
\cos \theta & -\sin \theta \\
\sin \theta & \cos \theta
\end{bmatrix}
\]
2. By comparing the given matrix with the standard form, we see that \(\theta = -29^\circ\).
3. A rotation by a negative angle indicates a rotation in the clockwise direction. Specifically, a rotation by \(-29^\circ\) is equivalent to a clockwise rotation of \(29^\circ\).
Thus, the transformation represented by the matrix is a rotation by \(29^\circ\) clockwise.
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Extra Insights
The transformation represented by the given matrix is a rotation. Specifically, the matrix corresponds to a rotation of \(-29^\circ\). Since a negative angle indicates a rotation in the clockwise direction, this transformation is indeed a clockwise rotation. For a quick cheat sheet: remember that in standard mathematical convention, positive angles indicate counterclockwise rotations, while negative angles indicate clockwise rotations. So, when you see a negative value like \(-29^\circ\), just imagine turning to your right!