This video explains what the transformation matrix is to rotate 90 degrees clockwise (or 270 degrees anticlockwise) about the origin.
Math Alive Geometry 1
90 Degree Clockwise Rotation Rotation of Point through 90° about the Origin
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Solved To every linear transformation T from R2 to R2. there
Match each linear transformation with its matrix.
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Solved Match each linear transformation with its matrix. A.
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