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January 26, 2015

January 26, 2015

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

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 10:04pmif x = 300 degrees

cos x = 0.5

but

arccos(.5) = 60 degrees

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