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D( x )
x/1.13 < 0
x/1.13 < 0
x/1.13 < 0
0.88495575*x+0 < 0 // - 0
0.88495575*x < 0 // : 0.88495575
x < 0/0.88495575
x < 0
x in <0:+oo)
(x/1.13)^0.13 = 0
0.88495575^0.13*x^0.13 = 0 // : 0.88495575^0.13
x^0.13 = 0
x = 0
x = 0
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