The video shows a person's hand holding a blue marker and writing on a piece of paper. The paper has a diagram drawn on it, and the person is writing mathematical equations next to the diagram. The person's hand moves quickly as they write, and the camera angle is focused on the paper and the person's hand. The lighting in the video is bright, and the colors are vivid. The person's hand is steady, and they appear to be experienced in writing mathematical equations. The camera angle is fixed, and there is no background noise or music.