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**1. Homework Statement**

Let f(x)=cos (x). Denote f^2(x) = ff(x), f^3(x)=fff(x) and so on.

For x=100 radians, find f^n(x) for n=1 to 20

Develop a calculator technique to find f^n(x) for any given value of n. Hence, find correct to 7 decimal places, the limit of f^n(x) for x= 100 radians and n approaching infinity.

**2. Homework Equations**

**3. The Attempt at a Solution**

sorry,i have no idea how to tackle this question.can any1 help me?=)

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