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