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D( x )
x < 0
x^(9/20) = 0
x < 0
x^(9/20) = 0
x^(9/20) = 0
1*x^(9/20) = 0 // : 1
x^(9/20) = 0
x = 0
x in (0:+oo)
1/(x^(9/20)) = 1/512 // - 1/512
1/(x^(9/20))-(1/512) = 0
1/(x^(9/20))-1/512 = 0
1*x^(-9/20) = 1/512 // : 1
x^(-9/20) = 1/512
-9/20 < 0
1/(x^(9/20)) = 1/512 // * x^(9/20)
1 = 1/512*x^(9/20) // : 1/512
512 = x^(9/20)
x^(9/20) = 512 // ^ 20
x^9 = 1532495540865888858358347027150309183618739122183602176 // ^ 1/9
x = 1048576
x = 1048576
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