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D( x_1 )
x_1 = 0
x_1 = 0
x_1 = 0
x_1 in (-oo:0) U (0:+oo)
6/x_1 < 1 // - 1
6/x_1-1 < 0
6*x_1^-1 < 1
6*x_1^-1 < 1 // : 6
x_1^-1 < 1/6
1/(x_1^1) < 1/6
x_1 <> 0
1/(x_1^1) < 1/6 // * x_1^2
(x_1^2)/(x_1^1) < 1/6*x_1^2
x_1^1 < 1/6*x_1^2
x_1-1/6*x_1^2 < 0
x_1^1*(1-1/6*x_1) < 0
x_1 < 0
-(abs(x_1))^1*(1/6*(abs(x_1))^1+1) < 0 // : -(abs(x_1))^1
1/6*(abs(x_1))^1+1 > 0
1/6*(abs(x_1))^1 > -1 // : 1/6
(abs(x_1))^1 > -1/1/6
(abs(x_1))^1 > -6 // ^ 1/1
abs(x_1) > (-6)^(1/1)
abs(x_1) > -6
x_1 in (-oo:0)
x_1 < 0
x_1 > 0
x_1^1*(1-(1/6*x_1^1)) < 0 // : x_1^1
1-(1/6*x_1^1) < 0
1 < 1/6*x_1^1 // : 1/6
1/1/6 < x_1^1 // ^ 1/1
(1/1/6)^(1/1) < x_1
x_1 in (6:+oo)
x_1 > 0
x_1 in (-oo:0) U (6:+oo)
x_1 in (-oo:0) U (6:+oo)
(-oo:0) U (6:+oo)
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