# Math Help - Integral of f(x)=1/x in [1,2]

1. ## Integral of f(x)=1/x in [1,2]

For how many equal sections need to divide [1,2] to ensure that all Riemann sums of the function f(x)=1/x in [1,2] will be close to int{[1,2], 1/x dx} to 0.001?

2. Originally Posted by Also sprach Zarathustra
For how many equal sections need to divide [1,2] to ensure that all Riemann sums of the function f(x)=1/x in [1,2] will be close to int{[1,2], 1/x dx} to 0.001?
Equate the formula for the maximum error to 0.001 and solve for n.

3. Which formula is that? Could you remind me?

4. Originally Posted by Also sprach Zarathustra
Which formula is that? Could you remind me?
See here: http://math.iit.edu/~mccray/Math149S...um20080410.pdf

5. Thank you very much!