Posted by dolora on Sunday, May 1, 2011 at 8:31pm.
some calculators have a key called "INV"
try
INV
COS
(6/11)
=
You should get appr. 56.944
If you have a key called "cos" , then at that keyt on the body of your calculator you should see cos^-1
in that case your calculator is able to take the inversecosine, sometimes called arc-cosine.
found it, thanks!
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