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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*(x/x+2)^2-(3*(x/x+2))-2 = 0
2*(x/x+2)^2-3*(x/x+2)-2 = 0
2*3^2-3*3-2 = 0
2*3^2-3*3-2 = 0
9-2 = 0
7 = 0
7 = 0
x belongs to the empty set
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