Questions in fun-lim

Select	Question
	The graph of the function $y=f(x)$ is symmetrical about the line $x=2$, then
	If $f(x)=\frac{x}{x-1}=\frac{1}{y}$, then $f(y)=$
	If $y=f(x)=\frac{ax+b}{cx-a}$, then x is equal to
	If $f(x)=\frac{{{x}^{2}}-1}{{{x}^{2}}+1}$, for every real numbers. then the minimum value of f
	$f(x,\ y)=\frac{1}{x+y}$ is a homogeneous function of degree
	Let x be a non-zero rational number and y be an irrational number. Then xy is
	Numerical value of the expression $\left\| \ \frac{3{{x}^{3}}+1}{2{{x}^{2}}+2}\ \right\|$ for $x=-3$ is
	The function $f:R\to R,\ f(x)={{x}^{2}},\forall x\in R$ is
	If for two functions $g$ and $f$, $gof$ is both injective and surjective, then which of the following is true
	The function which map [–1, 1] to [0, 2] are