Here is the graph of f(x) = cos 2x.

a) Which of the following domains ensures that the function
f(x) = cos 2x is one-to-one?

b) What is the range of f(x) for this domain?

c) Find an expression for a possible inverse function for f(x) = cos 2x.

d) Write down the domain and range of the inverse function f⁻¹(x).

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