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D( x )
x < 0
x < 0
x in <0:+oo)
66 = 4*x^(3/2) // - 4*x^(3/2)
66-(4*x^(3/2)) = 0
66-4*x^(3/2) = 0
-4*x^(3/2) = -66 // : -4
x^(3/2) = 33/2
x^(3/2) = 33/2 // ^ 2
x^3 = 1089/4 // ^ 1/3
x = (1089/4)^(1/3)
x = (1089/4)^(1/3)
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