The problem is to estimate given that , x = 4, and I have tried this and found that the approximate change in y is dy = 0.03 and the actual change in y is 0.0301, but I am not sure what to do with this information.
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at , and (note that y(4.01) = -3.9699 for reference)
Oh, I see. I wonder why they didn't write or something to that effect; it would have been a little easier for a simpleton like me.
Telling you that "x= 4" does tell you that "y" refers to "y(4)".
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