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D( X )
cos(27) = 0
cos(27) = 0
cos(27) = 0
t_1 = cos(27)
cos(27) = 0
t_1 = 0
X należy do R
X in (-oo:+oo)
X belongs to the empty set
tan(27)*(X/130) = 0
X belongs to the empty set
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