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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
16/x-(192/(x^2))-36-6 = 1 // - 1
16/x-(192/(x^2))-36-6-1 = 0
16/x-192*x^-2-36-6-1 = 0
16*x^-1-192*x^-2-43 = 0
t_1 = x^-1
16*t_1^1-192*t_1^2-43 = 0
16*t_1-192*t_1^2-43 = 0
DELTA = 16^2-(-192*(-43)*4)
DELTA = -32768
DELTA < 0
x belongs to the empty set
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