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