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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((36-(25*X^2))/(x^2))^3)/2 = 0
(((36-25*X^2)/(x^2))^3)/2 = 0
((36-25*X^2)^3)/(2*(x^2)^3) = 0
x belongs to the empty set
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