# Approximate integration

Gold Member

## Homework Statement

This is technically an E&M question, but I've reduced it to a calculus problem. Basically I have to evaluate:

$$B_0(\int_{-H_{max}}^{H_{max}}{tanh(\frac{H+H_c}{H_0})dH - \int_{-H_{max}}^{H_{max}}{tanh(\frac{H-H_c}{H_0})dH)$$

Where $$H_{max}>>H_C, H_0$$.

## The Attempt at a Solution

I'm looking at this and I have no idea how to go about approximating this integral...I suppose I could just brute force the integrals and keep all the H_max and stuff, and then later see if i can approximate something...but the expressions are really quite long and I'd like to avoid that if I can. Is there a way?

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tiny-tim
Homework Helper
Hi Matterwave!

Are Hc and H0 constants?

If so, that's just ∫tanh(Ax + b) dx …

and ∫tanh is ln(cosh)

D H
Staff Emeritus