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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
2/a = 1.61 // - 1.61
2/a-1.61 = 0
2*a^-1 = 1.61 // : 2
a^-1 = 0.805
-1 < 0
1/(a^1) = 0.805 // * a^1
1 = 0.805*a^1 // : 0.805
1.24223602 = a^1
a = 1.24223602
a = 1.24223602
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