推 claudina : 05/27 19:08
※ 引述《claudina (claudina)》之銘言：
: Let S be the surface parametrized by r(θ,z)=3sin2θi+6sin^2θj+zk where
: 0<=θ<=π. Which of the following is equivalent to the surface differential
: d∂?
好吧..還是我回你了
剛好我也要考台聯大
i j k i j k
dx/dθ dy/dθ dz/dθ 6cos2θ 12sinθcosθ 0
∣ ∣ ＝ ｜ ｜
dx/dz dy/dz dz/dz 0 0 1
= ｜ i6sin2θ-j6cos2θ ｜ 取絕對值答案= 6dθdz
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