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D( x )
60*x^2 = 0
60*x^2 = 0
60*x^2 = 0
60*x^2 = 0 // : 60
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
((12*x^1)/2)/(60*x^2) = 0
((12*x)/2)/(60*x^2) = 0
1/10*x^-1 = 0 // : 1/10
x^-1 = 0
x należy do O
x belongs to the empty set
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