Let  $f:R\to R$ be defined as  $f\left(x\right)=\{\begin{array}{l}\frac{\lambda |x^2-5x+6|}{\mu (5x-x^2-6)},x<2\\ e^{\frac{\tan (x-2)}{x-\left[x\right]}},x>2\\ \mu ,x=2\end{array}$  where [x] is the greatest integer less than or equal to x. if f(x) is continuous at x = 2, then  $\lambda -\mu$ is equal to: