Which the equations d 1 f x y z 22xz 2 x y 2yz d 2 f x

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Unformatted text preview: false. The function does not even have to be continuous at a. 7. Prove that if f and g are both differentiable at a point a in R n then so is the function f  g and we have fg a  f a g a . This assertion is very easy. 417...
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