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