Q: Use the formula and where necessary.

, at and at . Use step length of to estimate the value at to decimal places.

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I differentiated to find and substituted values into the equation at the point and used to find . However, I got the answer to be to decimal places but the answer is . Can someone try this question and see if they get correct answer. If possible, can you post the method so I can compare with mine and spot me mistake. Thanks in advance.