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[tex]\\ \rm\longmapsto P(x,y)[/tex]
[tex]\\ \rm\longmapsto \left(\dfrac{-2+4}{2},\dfrac{1-4}{2}\right)[/tex]
[tex]\\ \rm\longmapsto \left(\dfrac{2}{2},\dfrac{-3}{2}\right)[/tex]
[tex]\\ \rm\longmapsto \left(1,\dfrac{-3}{2}\right)[/tex]