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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
-2/p = 4/11 // - 4/11
-2/p-(4/11) = 0
-2/p-4/11 = 0
-2*p^-1 = 4/11 // : -2
p^-1 = -2/11
-1 < 0
1/(p^1) = -2/11 // * p^1
1 = -2/11*p^1 // : -2/11
-11/2 = p^1
p = -11/2
p = -11/2
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