trig1 more question

it is always true that if -1 ≤ x ≤ 1 then

cos(Arccos(x)) = x

Give an example showing that Arccos(cos(x))= x need NOT be true for all x

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  1. if x = 300 degrees
    cos x = 0.5
    but
    arccos(.5) = 60 degrees

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