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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16*x^3-(9/x) = 0
16*x^3-9*x^-1 = 0
16*x^3-9*x^-1 = 0
x^-1*(16*x^4-9) = 0
16*x^4 = 9 // : 16
x^4 = 9/16
x^4 = 9/16 // ^ 1/4
abs(x) = (9/16)^(1/4)
x = (9/16)^(1/4) or x = -(9/16)^(1/4)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x in { (9/16)^(1/4), -(9/16)^(1/4) }
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