運算式 1: "r" less than or equal to 3 cosine left parenthesis, 7 halves theta plus "n" sin left parenthesis, 7 halves theta , right parenthesis , right parenthesis plus 7r≤3cos72θ+nsin72θ+7
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定義域 \theta 最小值:
less than or equal to theta less than or equal to≤θ≤