Rotating a vector around a point

You can rotate a Vector2 or coordinate, around a pivot point, by theta degrees, using some simple trig methods. I've written a method for this in C#, with the help of some geniuses on stack exchange below:

     /// <summary>
     /// Magical math function that helps to adjust fire direction
     /// when camera is turning
     /// </summary>
     /// <param name="Point">Point to rotate</param>
     /// <param name="Pivot">Pivot point to rotate point around</param>
     /// <param name="Angle">By how many radians to rotate point by</param>
     /// <returns>Rotated point positions</returns>
     Vector2 RotatePointAroundPivot(Vector2 Point, Vector2 Pivot, float Angle)
     {
         float sinAngle = Mathf.Sin(Angle);
         float cosAngle = Mathf.Cos(Angle);
 
         Vector2 OriginPoint = new Vector2
         (
             Pivot.x - Point.x,
             Pivot.y - Point.y
         );
 
         float NewXPoint = OriginPoint.x * cosAngle - OriginPoint.y * sinAngle;
         float NewYPoint = OriginPoint.x * sinAngle + OriginPoint.y * cosAngle;
 
         Vector2 RotatedPoint = new Vector2
         (
             NewXPoint + Point.x,
             NewYPoint + Point.y
         );
 
         return RotatedPoint;
     }
 

I actually don't think this is the answer to your question in mind when reading the description, but nevertheless, it is here.

I'm guessing you could rotate the mouse position by a pivot point and then re-add the z component? @unity_cJpDgSl63jDPGA