Logarithm/Integration of hyperbola/Function equation/Exercise

Prove the relationship

${\int }_1^{ab}\frac{1}{x}dx={\int }_1^a\frac{1}{x}dx+{\int }_1^b\frac{1}{x}dx$

for $a,b\in {ℝ}_{+}$, only using rules for integration.

Create a solution