Mathematics - Functions Question with Solution | TestHub

Let $f\left(x+\frac{1}{y}\right)+f\left(x-\frac{1}{y}\right)=2f(x)f\left(\frac{1}{y}\right)\forall x,y\in R,y\ne 0$ and $f(0)=0$ then the value of $f(1)+f(2)=$