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D( a )
sin(79) = 0
sin(79) = 0
sin(79) = 0
t_1 = sin(79)
sin(79) = 0
t_1 = 0
a naleu017Cy do R
a in (-oo:+oo)
a belongs to the empty set
a = 9.8/sin(79)
a belongs to the empty set
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