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January 31, 2015

January 31, 2015

Posted by **dolora** on Sunday, May 1, 2011 at 8:31pm.

- trig -
**Reiny**, Sunday, May 1, 2011 at 8:39pmsome 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.

- trig -
**dolora**, Sunday, May 1, 2011 at 9:12pmfound it, thanks!

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