90 Degree Clockwise Rotation Transformation Matrix

This video explains what the transformation matrix is to rotate 90 degrees clockwise (or 270 degrees anticlockwise) about the origin.

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What is the matrix for the rotation, when the point p (3,-5) is rotating through angle 60 anticlockwise about the origin? - Quora

Rotate a matrix by 90 degree without using any extra space

What is the matrix for the rotation, when the point p (3,-5) is rotating through angle 60 anticlockwise about the origin? - Quora

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Linear Transformation Combination of CCW 90 Rotation and Reflection on y = -x With Product Of Matrix

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