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D( x )
sin(33) = 0
sin(20) = 0
sin(33) = 0
sin(33) = 0
t_1 = sin(33)
sin(33) = 0
t_1 = 0
x należy do R
x in (-oo:+oo)
sin(20) = 0
sin(20) = 0
t_2 = sin(20)
sin(20) = 0
t_2 = 0
x należy do R
x in (-oo:+oo)
x belongs to the empty set
9/sin(33) = x/sin(20)
x belongs to the empty set
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