There is a function problem in Grade One of Senior High School, which requires that the images of the following piecewise functions be made separately, and the definition domain and value domain should be written (as long as it can describe how to draw them). (1) domain: (0, positive infinity), range:. As long as you pay attention to the endpoint of the image, the closed interval is solid and the open interval is hollow.

(3) domain: R. Range: [0, positive infinity). The image only needs to change from the lower half of the X axis to the upper half through axial symmetry.