Zadatak 1918

Test: MPsIIVAI_329

 

N Uprosti izraz $$\frac{xy-\sqrt{x^2-1}\cdot \sqrt{y^2-1}}{xy+\sqrt{x^2-1}\cdot \sqrt{y^2-1}}$$ ako je $$x=\frac{1}{2}\left ( a+\frac{1}{a} \right ), y=\frac{1}{2}\left ( b+\frac{1}{b} \right ),0<a\leq 1,0<b\leq 1$$