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Question Number 141580 by learner001 last updated on 20/May/21
i am finding it difficult to form a pde  from the function f(x+y+z, x^2 +y^2 +z^2 ).
$${i}\:{am}\:{finding}\:{it}\:{difficult}\:{to}\:{form}\:{a}\:{pde} \\ $$$${from}\:{the}\:{function}\:{f}\left({x}+{y}+{z},\:{x}^{\mathrm{2}} +{y}^{\mathrm{2}} +{z}^{\mathrm{2}} \right). \\ $$

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