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OCW Scholar - Multivariable Calculus 9 Online
OpenStudy (anonymous):

Why the Approximation Formula in Session 27 is dz = f_x dx+f_y dy?Why do you add up f_x dx and f_y dy? Isn't strange?

OpenStudy (anonymous):

\[\Delta z= f_x \Delta x+f_y \Delta y\]

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