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2 April, 11:42

I need to know the easiest trick to do rotations

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  1. 2 April, 11:46
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    90º (-270º) : (x, y) - - - > (y, - x)

    180º (-180º) : (x, y) - - - > (-x, - y)

    270º (-90º) : (x, y) - - - > (-y, x)
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