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D( x )
tan(50) = 0
cos(50) = 0
tan(50) = 0
tan(50) = 0
t_1 = tan(50)
tan(50) = 0
t_1 = 0
x należy do R
x in (-oo:+oo)
cos(50) = 0
cos(50) = 0
t_2 = cos(50)
cos(50) = 0
t_2 = 0
x należy do R
x in (-oo:+oo)
x belongs to the empty set
x = 8.9/tan(50)
x belongs to the empty set
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