The Cartesian Ram
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\(\fbox{2}\) Cosine of Cosine (non-calculator)
Let \[ f(x) = \cos (\cos(x))\]
(i) Find all solutions of \(f(x)=1\)
(ii) Find the range of \(f(x)\)
(iii) Show that \(f(x)\) is periodic and find its period
[Check your answers using your GDC or
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Solution