If the current density in a conducting medium

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If the current density in a conducting medium is given by
J(x,y,z;t)=(x^z−y^4y2+z^2x)cosωtJ(x,y,z;t)=(x^z−y^4y2+z^2x)cos⁡ωt

determine the corresponding charge distribution ρv(x,y,z;t)ρv(x,y,z;t).