Expression 1: "r" equals StartFraction, 1 Over cos left parenthesis, mod left parenthesis, theta , StartNestedFraction, 2 pi NestedOver 3 , EndNestedFraction , right parenthesis minus StartNestedFraction, pi NestedOver 3 , EndNestedFraction , right parenthesis , EndFractionr=1cosmodθ,2π3−π3
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domain \theta Minimum:
less than or equal to theta less than or equal to≤θ≤