Asked 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
cos(Arccos(x)) = x
Give an example showing that Arccos(cos(x))= x need NOT be true for all x
Answers
Answered by
Damon
if x = 300 degrees
cos x = 0.5
but
arccos(.5) = 60 degrees
cos x = 0.5
but
arccos(.5) = 60 degrees
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