The total charge enclosed in an incremental volume of 2 × 10^-9 m^3 located at the origin is \ \ \ \ nC, if electric flux density of its field is…

The total charge enclosed in an incremental volume of $\displaystyle 2 \times 10^{-9} \mathrm{~m}^3$ located at the origin is \_\_\_\_ nC, if electric flux density of its field is found as $$\mathrm{D}=\mathrm{e}^{-x} \sin y \hat{i}-\mathrm{e}^{-x} \cos y \hat{j}+2 z \hat{k} \mathrm{C} / \mathrm{m}^2 . $$