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D( r )
8*r < 0
8*r < 0
8*r < 0
8*r+0 < 0 // - 0
8*r < 0 // : 8
r < 0/8
r < 0
r in <0:+oo)
r = (8*r)^(1/2) // - (8*r)^(1/2)
r-(8*r)^(1/2) = 0
r-2*2^(1/2)*r^(1/2) = 0
t_1 = r^(1/2)
1*t_1^2-2*2^(1/2)*t_1^1 = 0
t_1^2-2*2^(1/2)*t_1 = 0
DELTA = (-2*2^(1/2))^2-(0*1*4)
DELTA = 8
DELTA > 0
t_1 = (8^(1/2)-(-2*2^(1/2)))/(1*2) or t_1 = (-(-2*2^(1/2))-8^(1/2))/(1*2)
t_1 = (2*2^(1/2)+2*2^(1/2))/2 or t_1 = (2*2^(1/2)-2*2^(1/2))/2
t_1 = (2*2^(1/2)-2*2^(1/2))/2
r^(1/2)-((2*2^(1/2)-2*2^(1/2))/2) = 0
1*r^(1/2) = 0 // : 1
r^(1/2) = 0
r = 0
t_1 = (2*2^(1/2)+2*2^(1/2))/2
r^(1/2)-((2*2^(1/2)+2*2^(1/2))/2) = 0
1*r^(1/2) = -(-2*2^(1/2)) // : 1
r^(1/2) = 2*2^(1/2)
r^(1/2) = 2*2^(1/2) // ^ 2
r = 8
r in { 0, 8 }
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