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D( y )
y = 0
cos(42) = 0
y = 0
y = 0
cos(42) = 0
cos(42) = 0
t_1 = cos(42)
cos(42) = 0
t_1 = 0
y należy do R
y in (-oo:+oo)
y belongs to the empty set
tan(42) = 5/y
y belongs to the empty set
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