Đạo hàm trong miền Z:

\(kx\left. k \right.↔z-z\frac{dX(z)}{dz}\)

\(kx\left. k \right.↔z-z\frac{dX(z)}{dz}\)

\(-kx\left. k \right.↔z-z\frac{dX(z)}{dz}\)

\(kx\left. k \right.↔z-\frac{dX(z)}{zdz}\)