Let h[n] = (0.6)^n*sin(3πn/5)*u[n]. Find the system output when x[n] = 1 + cos(3πn/5) + (−1)^n.

I get the DTFT of h[n] already. what’s the DTFT of x[n] and how to get y[n] after IDTFT? Some steps pls.

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