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D( x )
cos(3/5) = 0
cos(3/5) = 0
cos(3/5) = 0
t_1 = cos(3/5)
cos(3/5) = 0
t_1 = 0
x należy do R
x in (-oo:+oo)
x belongs to the empty set
Y = tan(3/5)*x
x belongs to the empty set
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