Expression 3: "r" left parenthesis, theta , right parenthesis equals "a" minus left parenthesis, negative 1 , right parenthesis Superscript, "n" , Baseline "a" sine left parenthesis, theta , right parenthesisrθ=a−−1nasinθ
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domain \theta Minimum:
less than or equal to theta less than or equal to≤θ≤