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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
1/2 = 2/p // - 2/p
1/2-(2/p) = 0
1/2-2*p^-1 = 0
-2*p^-1 = -1/2 // : -2
p^-1 = 1/4
-1 < 0
1/(p^1) = 1/4 // * p^1
1 = 1/4*p^1 // : 1/4
4 = p^1
p = 4
p = 4
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