If $$f(x)=\frac{2 x+3}{3 x-2}, x \neq \frac{2}{3}$$, then the function $$f$$ of is

The domain of the real valued function $f(x)=\sqrt{\frac{x-2}{3-x}}$ is......

Which of the following function has period 2?

If $f(x)=3 x+6, g(x)=4 x+k$ and $f \circ g(x)=g \circ f(x)$ then $k=$