Let x1(n) = sin (nω)u(n). Now we can write
The given expression is x(n) = ancos (nω)u(n) = anx1(n)
∴ X(z) = Z[anx1(n)]
Using scaling property, we can write
Hence, the obtained z-transformation pair is
Table 6.1 gives the standard z-transform pairs.
Table 6.1 Standard z-transform pairs.
Example 6.4 Find the z-transform of the following signal with the help of linearity and ...