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General

Easy

Question

# Let is given by

Hint:

### In this question, we have to find inverse of function f(x) . Firstly, we will assume x to be cos and y to be cos 3. Then, we will find f(x) for x = cos and later find the value of from that equation. Now, finding inverse of f(y). Further, replacing y with x to get the required inverse of f(x).

## The correct answer is:

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