Question: At the beginning of this section we considered the function f (x, y) = sin(x 2 + y 2 )/x 2 + y 2 and

At the beginning of this section we considered the function

f (x, y) = sin(x² + y²)/x² + y²
and guessed on the basis of numerical evidence that f (x, y) → 1 as (x, y) → (0, 0). Use polar coordinates to confirm the value of the limit. Then graph the function.

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