Use the definition of differentiability to prove that the following functionns are differentiable at (0,0). You must produce functions, ɛ1 and ɛ2 with the required properties. a.) f(x, y) = x + y b.) f(x, y) = xy

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Chapter1: Functions And Models
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Please answer function b. Use the definition of differentiability attached below.

DEFINITION Differentiability
The function z = f(x, y) is differentiable at (a, b) provided f,(a, b) and f,(a, b)
exist and the change Az = f(a + Ar, b + Ay) – f(a, b) equals
Az = f,(a, b) Ax + f,(a, b) Ay + ɛ,Ax + ɛ,Ay,
where for fixed a and b, ɛ, and ɛ, are functions that depend only on Ax and Ay,
with (81, 82) → (0,0) as (Ax, Ay)→ (0, 0). A function is differentiable on an
open set R if it is differentiable at every point of R.
Transcribed Image Text:DEFINITION Differentiability The function z = f(x, y) is differentiable at (a, b) provided f,(a, b) and f,(a, b) exist and the change Az = f(a + Ar, b + Ay) – f(a, b) equals Az = f,(a, b) Ax + f,(a, b) Ay + ɛ,Ax + ɛ,Ay, where for fixed a and b, ɛ, and ɛ, are functions that depend only on Ax and Ay, with (81, 82) → (0,0) as (Ax, Ay)→ (0, 0). A function is differentiable on an open set R if it is differentiable at every point of R.
Use the definition of differentiability to prove that the following functionns are differentiable at (0,0).
You must produce functions, ɛ1 and ɛ2 with the required properties.
a.) f(x, y) = x + y
b.) f(x, y) = xy
Transcribed Image Text:Use the definition of differentiability to prove that the following functionns are differentiable at (0,0). You must produce functions, ɛ1 and ɛ2 with the required properties. a.) f(x, y) = x + y b.) f(x, y) = xy
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