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Asked for the indefinite integral ⌠ln(x+f) ⎮─────── dx ⌡ x+a Wolfram|Alpha returns ⎛ f+x⎞ ⎛a+x⎞ I(x) ≡ Li₂⎜- ───⎟ + log(f+x)log⎜───⎟ + const. ⎝ a-f⎠ ⎝a-f⎠ For `a =...