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#1
[tex]\\ \sf\longmapsto (0,0)\cup (2,0)[/tex]
#2
[tex]\\ \sf\longmapsto (-11,0)\cup (0,0)[/tex]
#3
[tex]\\ \sf\longmapsto \left[(1,0),(-2,0),(-6,0),(-11,0)\right][/tex]
#4#5#6
Will be same like #1#2#3 respectively