Question

a-b/a+a/b-a^2-b^2/ab

Answer 1

$frac{a-b}{a}^{(b}+ frac{a}{b}^{(a} - frac{a^2-b^2}{ab}^{(1}= frac{b(a-b)+a^2-(a^2-b^2)}{ab}=frac{ab-b^2+a^2-a^2+b^2}{ab}= frac{ab}{ab}=1$