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D( x )
x = 0
4*x = 0
x = 0
x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
4-(1/x)^2-(2*(3/(4*x))^2) = 0
4-(1/x)^2-2*(3/(4*x))^2 = 0
-17/8*x^-2 = -4 // : -17/8
x^-2 = 32/17
-2 < 0
1/(x^2) = 32/17 // * x^2
1 = 32/17*x^2 // : 32/17
17/32 = x^2
x^2 = 17/32 // ^ 1/2
abs(x) = (17/32)^(1/2)
x = (17/32)^(1/2) or x = -(17/32)^(1/2)
x in { (17/32)^(1/2), -(17/32)^(1/2) }
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