Homework Help: trig1 more question

Posted by richard on Tuesday, May 4, 2010 at 9:53pm.

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

trig1 more question - Damon, Tuesday, May 4, 2010 at 10:04pm
if x = 300 degrees
cos x = 0.5
but
arccos(.5) = 60 degrees

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