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D( x )
cos(65) = 0
cos(65) = 0
cos(65) = 0
t_1 = cos(65)
cos(65) = 0
t_1 = 0
x naleu017Cy do R
x in (-oo:+oo)
x belongs to the empty set
x = 5/cos(65)
x belongs to the empty set
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