Consider the following strain tensor:

$e_{ij}=\left[\begin{array}{ccc}0\mathrm{.}002& -0\mathrm{.}002& 0\\ -0\mathrm{.}002& -0\mathrm{.}004& 0\mathrm{.}001\\ 0& 0\mathrm{.}001& 0\mathrm{.}006\end{array}\right]$

Determine the spherical and deviatoric strain tensors and the first invariant of the deviatoric

strain tensor.