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D( x )
9^4*x = 0
9^4*x = 0
9^4*x = 0
6561*x = 0 // : 6561
x = 0
x in (-oo:0) U (0:+oo)
(9^(x^2))/(9^4*x) = 0
(9^(x^2))/(9^4*x) = 0 // * 9^4*x
9^(x^2) = 0
x należy do O
x belongs to the empty set
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