Expression 1: "r" equals left parenthesis, cos left parenthesis, theta , right parenthesis , right parenthesis times left parenthesis, 4 times sin left parenthesis, theta , right parenthesis squared minus 1 , right parenthesisr=cosθ·4·sinθ2−1
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domain \theta Minimum:
less than or equal to theta less than or equal to≤θ≤