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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
y = (x^2)/(x^2)-4 // - (x^2)/(x^2)-4
y-((x^2)/(x^2))+4 = 0
y-1+4 = 0
y+3 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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