Indeed, anytime I move something on the screen at an angle for a distance, I have to do a quick check to remember whether the horizontal distance is sin or cos.

Indeed, anytime I move something on the screen at an angle for a distance, I have to do a quick check to remember whether the horizontal distance is sin or cos. I do this probably half a dozen times a month. (I'm not a quick learner.) I was kind of surprised that the article used circular motion as its main motivating point, since I feel like just moving at some angle is so much more common.