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2 Bobrek Villamizar Isabella, Grado 11º A,  Actividad

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x^2 + y^2 - 4x + 2y -20 = 0
2x+2yy´-4+2y´=0
2x+2yy´+2y´=4
y´(2y+2)=4-2x
y´=(4-2x)/2y+2