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D( r )
r^2 = 0
r^2 = 0
r^2 = 0
1*r^2 = 0 // : 1
r^2 = 0
r = 0
r in (-oo:0) U (0:+oo)
3.14*4*r^2-(50.4/(r^2)) = 0
3.14*4*r^2-50.4*r^-2 = 0
12.56*r^2-50.4*r^-2 = 0
t_1 = r^2
12.56*t_1^1-50.4*t_1^-1 = 0
12.56*t_1-50.4*t_1^-1 = 0
t_1^-1*(12.56*t_1^2-50.4) = 0
12.56*t_1^2 = 50.4 // : 12.56
t_1^2 = 4.01273885
t_1^2 = 4.01273885 // ^ 1/2
abs(t_1) = 4.01273885^(1/2)
t_1 = 4.01273885^(1/2) or t_1 = -4.01273885^(1/2)
1/t_1 = 0
1*t_1^-1 = 0 // : 1
t_1^-1 = 0
t_1 należy do O
t_1 = 4.01273885^(1/2)
r^2-4.01273885^(1/2) = 0
1*r^2 = 4.01273885^(1/2) // : 1
r^2 = 4.01273885^(1/2)
r^2 = 4.01273885^(1/2) // ^ 1/2
abs(r) = 4.01273885^(1/4)
r = 4.01273885^(1/4) or r = -4.01273885^(1/4)
t_1 = -4.01273885^(1/2)
r^2+4.01273885^(1/2) = 0
1*r^2 = -4.01273885^(1/2) // : 1
r^2 = -4.01273885^(1/2)
r^2 = 4.01273885^(1/2) // ^ 1/2
abs(r) = 4.01273885^(1/4)
r = 4.01273885^(1/4) or r = -4.01273885^(1/4)
r in { 4.01273885^(1/4), -4.01273885^(1/4), 4.01273885^(1/4), -4.01273885^(1/4) }
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