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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
6.3/h = -4.05*2 // + -4.05*2
6.3/h-(-4.05*2) = 0
6.3/h+8.1 = 0
6.3*h^-1 = -8.1 // : 6.3
h^-1 = -1.28571429
-1 < 0
1/(h^1) = -1.28571429 // * h^1
1 = -1.28571429*h^1 // : -1.28571429
-0.77777778 = h^1
h = -0.77777778
h = -0.77777778
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