If fx is an odd function, f1=3, and fx+2=fx+f2, then the value of f3 is ______
Given fx+2=fx+f2Put x=-1. Then f1=f-1+f2or f1=-f1+f2 as fx is an odd functionor f2=2f1=6Now, put x=1We have f3=f1+f2=3+6=9.