DLMF:19.18.E15 (Q6358)

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DLMF:19.18.E15
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    2 W t 2 = 2 W x 2 + 2 W y 2 . partial-derivative 𝑊 𝑡 2 partial-derivative 𝑊 𝑥 2 partial-derivative 𝑊 𝑦 2 {\displaystyle{\displaystyle\frac{{\partial}^{2}W}{{\partial t}^{2}}=\frac{{% \partial}^{2}W}{{\partial x}^{2}}+\frac{{\partial}^{2}W}{{\partial y}^{2}}.}}
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