If  $\mathrm{f}:\mathrm{R}\to \mathrm{R}$ is defined by  $\mathrm{f}\left(\mathrm{x}\right)=\left\{\begin{array}{cc}\frac{1+3{\mathrm{x}}^2-\cos 2\mathrm{x}}{{\mathrm{x}}^2}& \text{ for }\mathrm{x}\ne 0\\ \mathrm{k}& \text{ for }\mathrm{x}=0\end{array}\right.$ is continuous at $\mathrm{x}=0$ then k = 

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