+0  
 
0
42
2
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column vector( 4,1) has been rotated to column vector (-1,4)which matrix carried out the transformation

 Oct 3, 2021
 #1
avatar+35058 
+1

  cos 243        -sin 243

-sin243          -cos 243                  Rotation is 242.928 clockwise    ( I rounded to 243 degrees) 

 Oct 3, 2021
edited by ElectricPavlov  Oct 3, 2021
 #2
avatar+35058 
+1

Seems I made that more difficult than necessary.....

 

rotate the vector 90 degree counter clockwise

 

cos 90     - sin 90

sin 90       cos 90        or :           0     -1

                                                   1      0

ElectricPavlov  Oct 4, 2021

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