Find the domain of f(x) = cos–1 x + cos x.
Domain of 
lies in the interval [–1, 1].
Domain of cos x lies in the interval [0, 
] = [0, 3.14]
Domain of 
+ cos x lies in the interval [–1, 1].
3
Find the domain of f(x) = cos–1 x + cos x.
Domain of lies in the interval [–1, 1].
Domain of cos x lies in the interval [0, ] = [0, 3.14]
Domain of + cos x lies in the interval [–1, 1].