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D( P )
P = 0
P = 0
P = 0
P in (-oo:0) U (0:+oo)
1200 = 1000/P+25.78 // - 1000/P+25.78
1200-(1000/P)-25.78 = 0
1200-1000*P^-1-25.78 = 0
-1000*P^-1 = -1174.22 // : -1000
P^-1 = 1.17422
-1 < 0
1/(P^1) = 1.17422 // * P^1
1 = 1.17422*P^1 // : 1.17422
0.85162917 = P^1
P = 0.85162917
P = 0.85162917
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