Coordinate System help please

How to turn 90 degrees to the left or right from given point (x,y) ?

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(-y,x) for 90 clockwise
(y,-x) for 90 anticlockwise
In general for change in angle \theta clockwise
(xcos\theta -ysin\theta, ycos\theta + xsin\theta)

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Nice post ,… Thanx for creating

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