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x in (-oo:+oo)
k = 2*r*sin(v/2) // - 2*r*sin(v/2)
k-(2*r*sin(v/2)) = 0
k-2*r*sin(v/2) = 0
t_1 = sin(v/2)
k-2*r*sin(v/2) = 0
k-2*r*t_1 = 0
x belongs to the empty set
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