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D( p )
48-(10*p^2) = 0
48-(10*p^2) = 0
48-(10*p^2) = 0
48-10*p^2 = 0
-10*p^2 = -48 // : -10
p^2 = 24/5
p^2 = 24/5 // ^ 1/2
abs(p) = (24/5)^(1/2)
p = (24/5)^(1/2) or p = -(24/5)^(1/2)
p in (-oo:-(24/5)^(1/2)) U (-(24/5)^(1/2):(24/5)^(1/2)) U ((24/5)^(1/2):+oo)
(20*p^2)/(48-(10*p^2)) = 1 // - 1
(20*p^2)/(48-(10*p^2))-1 = 0
(20*p^2)/(48-10*p^2)-1 = 0
(20*p^2)/(48-10*p^2)+(-1*(48-10*p^2))/(48-10*p^2) = 0
20*p^2-1*(48-10*p^2) = 0
30*p^2-48 = 0
(30*p^2-48)/(48-10*p^2) = 0
(30*p^2-48)/(48-10*p^2) = 0 // * 48-10*p^2
30*p^2-48 = 0
30*p^2 = 48 // : 30
p^2 = 8/5
p^2 = 8/5 // ^ 1/2
abs(p) = (8/5)^(1/2)
p = (8/5)^(1/2) or p = -(8/5)^(1/2)
p in { (8/5)^(1/2), -(8/5)^(1/2) }
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