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D( x )
1-x < 0
1-x < 0
1-x < 0
1-x < 0
-x < -1 // * -1
x > 1
x in (-oo:1>
0 = (2/3)*(1-x)^(3/2) // - (2/3)*(1-x)^(3/2)
0-((2/3)*(1-x)^(3/2)) = 0
(-2/3)*(1-x)^(3/2) = 0
-2/3*(1-x)^(3/2) = 0
( -2/3 )
-2/3 = 0
x belongs to the empty set
( 1-x )
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x = 1
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