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Example 1: Increment and Total Differential (Product Function)

Find the increment and total differential of the product function z = xy (Figure 11.4.2).

Increment:

Δz = (x + Δx)(y + Δy) - xy = y Δx + x Δy + Δx Δy.

Total differential:

dz = (∂z/∂x) dx + (∂z/∂y) dy = y dx + x dy.

11_partial_differentiation-220.gif

Figure 11.4.2


Last Update: 2010-11-25