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An approximating formula dr(h) is used to calculate the derivative of a given function. With different steplengths these were the result ( in exact arithemtic and no rounding errors)

h      drh 0.1    0.50801203103 0.05   0.50100687738 0.001  0.50000000800 

Decide, with help from the table, how the error in this approximation formula depends on h. Hint: The error can be written as ch^p and I'm supposed to decide the p for this expression.

The last table value can, compared to the other two, be treated as the exact value of the derivative.

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