## Question

i) Find the Z transform of the functions: f(n)=7^-n cosnθ

ii) Find the Z transform of the functions: f(n)=5n+7cos(nπ/4)-9k

iii) Find the Z transform of the functions: f(n)=9n+3^-n sinnθ

iv) Find Z- inverse transform Z^-1[2z/(z-2)(z-2)]

v) Find the Z Inverse Transformation of the following function

F(z)=z/(z-1)(z+6)(z-1)