Question: 2. Define differentiability of s function f(x, y) at (x, y). Show that f(x, y) = (x + y) is differentiable at (0, 0).

2. Define differentiability of s function f(x, y) at (x, y). Show

2. Define differentiability of s function f(x, y) at (x, y). Show that f(x, y) = (x + y) is differentiable at (0, 0). 3. Given u(x,t)=sin(x-ct). Show that u du 012 Ox

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