Let denote the set of all positive rational numbers. Determine all functions satisfying for all
Let $\mathbb{Q}_{>0}$ denote the set of all positive rational numbers. Determine all functions $f:\mathbb{Q}_{>0}\to \mathbb{Q}_{>0}$ satisfying $$f(x^2f(y)^2)=f(x)^2f(y)$$for all $x,y\in\mathbb{Q}_{>0}$
Školjka 
denote the set of all positive rational numbers. Determine all functions 
satisfying 
for all 