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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(8*w^2)/x = (4*w)/c // - (4*w)/c
(8*w^2)/x-((4*w)/c) = 0
(8*w^2)/x-4*c^-1*w = 0
8*w^2*x^-1 = -(-4*c^-1*w) // : 8*w^2
x^-1 = (1/2)*c^-1*w^-1
-1 < 0
1/(x^1) = (1/2)*c^-1*w^-1 // * x^1
1 = (1/2)*c^-1*w^-1*x^1 // : (1/2)*c^-1*w^-1
2*c*w = x^1
x = 2*c*w
x = 2*c*w
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