What is the unit step response of the system described by the differen – McqOptions

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1.	What is the unit step response of the system described by the difference equation
A.	=0.9y(n-1)-0.81y(n-2)+x(n) under the initial conditions y(-1)=y(-2)=0?
B.	[1.099+1.088(0.9)<sup>n</sup>.cos(‚âà√¨‚àö√ën/3+5.2<sup>o</sup>)]u(n)
C.	[1.099+1.088(0.9)<sup>n</sup>.cos(‚âà√¨‚àö√ën/3-5.2<sup>o</sup>)]u(n)
D.	[1.099+1.088(0.9)<sup>n</sup>.cos(‚âà√¨‚àö√ën/3-5.2<sup>o</sup>)].
Answer» C. [1.099+1.088(0.9)<sup>n</sup>.cos(‚âà√¨‚àö√ën/3-5.2<sup>o</sup>)]u(n)

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