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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 = 4-((x^2)/(x^2)) // - 4-((x^2)/(x^2))
Y+(x^2)/(x^2)-4 = 0
Y-3 = 0
x naleu017Cy do R
x in (-oo:0) U (0:+oo)
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