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D( P )
P = 0
P = 0
P = 0
P in (-oo:0) U (0:+oo)
(P^-3)/4-((5*P^-19)/4) = 0
(P^-3)/4+(-5/4)*P^-19 = 0
1/4*P^-3-5/4*P^-19 = 0
1/4*P^-3*(1-5*P^-16) = 0
-5*P^-16 = -1 // : -5
P^-16 = 1/5
-16 < 0
1/(P^16) = 1/5 // * P^16
1 = 1/5*P^16 // : 1/5
5 = P^16
P^16 = 5 // ^ 1/16
abs(P) = 5^(1/16)
P = 5^(1/16) or P = -5^(1/16)
1/(4*P^3) = 0
1/4*P^-3 = 0 // : 1/4
P^-3 = 0
P naleu017Cy do O
P in { 5^(1/16), -5^(1/16) }
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