#Rect in matrix

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neat wren
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I've already done this

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but I don't know I can create a rect around delta1, delta2, etc.

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==== Cas où le nombre de variables = 3 :

$ "Hess"_f = mat(
  (partial^2 f)/(partial x^2), (partial^2 f)/(partial x partial y), (partial^2 f)/(partial x partial z);
  (partial^2 f)/(partial y partial x), (partial^2 f)/(partial y^2), (partial^2 f)/(partial y partial z);
  (partial^2 f)/(partial z partial x), (partial^2 f)/(partial z partial y), (partial^2 f)/(partial z^2)
) $
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thank you!