Session 27: Approximation Formula
Two questions about Example 1 in the PDF titled "The Tangent Approximation".
1. "Thus if |Δx|.01 andΔy|.01, we should have . . ."
Where do these .01 values come from? They appear to be arbitrary.
2. "So the answer is the square with center at(1,1) given by |x −1|.01, |y −1|.01 ." I don't understand what this answer means, what it is telling me. Are we literally talking about a square with dimensions a x b? If yes, I don't understand the logic of the question asking for a "reasonable square."

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