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[tex]\Delta f=\delta f+\Delta x[/tex]

For example [tex]f(x,y)=yx[/tex], [tex]y=y(x)[/tex]

[tex]\Delta f=x\delta y+\Delta x[/tex]

How is defined [tex]\Delta x[/tex]. Is that rate of change of x, while y is constant?

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# Total variation

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