To rotate a point (x, y) using a transformation matrix, you need to multiply the point by the rotation matrix. The result will be a new point (x', y'), which represents the rotated point. The matrix multiplication is done as follows:

'''shell
[x'] = [cos(θ) -sin(θ)][x]
[y'] [sin(θ) cos(θ)][y]
'''

Where 'θ' is the angle of rotation and (x, y) is the original point that you want to rotate. The result (x', y') is the rotated point. This rotation matrix can be used for both clockwise and counter-clockwise rotations, depending on the sign of 'θ'.
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