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Hello, i created an exercise to understand how to write a loop, iterative function,.... Y={{1,2,3,4,5,6,7}} universal formula: xn=120-e^Yn-an-1 zn=log[xn]*Yn+?xn An=Cos[zn] Step by step is this: X1=120-e^1-0 Z1=log[x1]*1+?x1 ...