Expression 1: "r" equals cosine ( pi / theta ) plus 2natural log ( 2 / theta ) left brace, 0 less than or equal to theta less than or equal to 10 , right bracer=cos(π/θ)+2ln(2/θ)0≤θ≤10
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domain \theta Minimum:
less than or equal to theta less than or equal to≤θ≤