DLMF:1.5.E31 (Q155)

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DLMF:1.5.E31
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    D f ( x , y ) d A = a b ϕ 1 ( x ) ϕ 2 ( x ) f ( x , y ) d y d x , subscript double-integral 𝐷 𝑓 𝑥 𝑦 𝐴 subscript superscript 𝑏 𝑎 subscript superscript subscript italic-ϕ 2 𝑥 subscript italic-ϕ 1 𝑥 𝑓 𝑥 𝑦 𝑦 𝑥 {\displaystyle{\displaystyle\iint_{D}f(x,y)\mathrm{d}A=\int^{b}_{a}\int^{\phi_% {2}(x)}_{\phi_{1}(x)}f(x,y)\mathrm{d}y\mathrm{d}x,}}
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