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prove that:
1. x[n]=x[n]*delta[n]
2.x[n-n0]=x[n]*delta{n-n0]
3.x[n]*u[n]=sum of x[k] from -∞ to n.
4.x[n]*u[n-n0)=sum of x[k] from -∞ to n-n0.
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