trig1 more question
posted by richard .
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

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