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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
Y = (2^2)/x // - (2^2)/x
Y-((2^2)/x) = 0
-4*x^-1 = -Y // : -4
x^-1 = Y/4
-1 < 0
1/(x^1) = Y/4 // * x^1
1 = (Y/4)*x^1 // : Y/4
4*Y^-1 = x^1
x = 4*Y^-1
x = 4*Y^-1
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