[積分] 極座標面積
r=kcos(3θ), k>0
標準答案是寫從0積到π/6然後再乘6倍,結果是(πk^2)/4
不過我好奇的是
為什麼
從0積到2π/3然後再乘3倍
以及
從0積到π然後再乘2倍
結果卻都變成(πk^2)/2 ???
ps.
如果今天是積 r=ksin(2θ)
就完全不會有這種問題@@
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※ 編輯: afflic 來自: 111.248.48.143 (07/20 05:22)
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