[積分] 一題重積分
Use a double integral to find the area of the region within both of the
circles r = cosθ and r = sinθ.
π √2 π
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4 2 4 sinθ
為什麼不能這樣列 2∫ ∫ r drdθ 而是要 2∫ ∫ r drdθ ?
0 sinθ 0 0
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