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D( x )
(0.01-x)*(4-(4*x))^4 = 0
(0.01-x)*(4-(4*x))^4 = 0
(0.01-x)*(4-(4*x))^4 = 0
(0.01-x)*(4-4*x)^4 = 0
( 0.01-x )
0.01-x = 0 // - 0.01
-x = -0.01 // * -1
x = 0.01
( 4-4*x )
4-4*x = 0 // - 4
-4*x = -4 // : -4
x = -4/(-4)
x = 1
x in (-oo:0.01) U (0.01:1) U (1:+oo)
x/((0.01-x)*(4-(4*x))^4) = 0
x/((0.01-x)*(4-4*x)^4) = 0
x = 0
x = 0
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