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Find the domain of f(x) = cos^–1 x + cos x.

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Find the domain of f(x) = cos–1x + cos x.

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Domain of cos-1x lies in the interval [–1, 1].

Domain of cos x lies in the interval [0, π] = [0, 3.14]

\(\therefore\) Domain of cos-1x + cos x lies in the interval [–1, 1].

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