Limits Continuity And Differentiability

If $f(x)=\left\{\begin{array}{cc}\frac{a|x|+x^2-2(\sin |x|)(\cos |x|)}{x} & , x \neq 0 \\ b & , x=0\end{array}\right.$


is continuous at $x=0$, then $a+b$ is equal to :