# trig

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how do you solve 2nd cos 6/11 (my calculator doesn't have 2nd function0

• trig -

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.

• trig -

found it, thanks!

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