Given that the coordinates of point a are (0.6,0.8), rotate OA anticlockwise around the origin of coordinates by 2 / 3 to OA, then the coordinates of point a are (0.6,0.8)__

Using the idea of vector,
Let the original connection origin vector be [R] theta, and the coordinates be {R * sin (theta), RCOs (theta)} = (0.6,0.8)@
Then the vector is [R] theta + 2 faction / 3, and the coordinate is {R * sin (theta + 2 faction / 3), RCOs (theta 2 faction / 3)}
Expand with the sum difference product formula and substitute @ into it~
The formula of rotation coordinate system can also be memorized directly

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