Explain why the function is differentiable at the given point. Then find the linearization L(x, y) of the function at that point. f(x, y) = 4 arctan(xy), (1, 1)

**Answer**

1)

2)

3)

Explain why the function is differentiable at the given point. Then find the linearization L(x, y) of the function at that point. f(x, y) = 4 arctan(xy), (1, 1)

**Answer**

1)

2)

3)