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