SOLUTION: I need to know the inverse of cosine of cos 2/7 The problem is written out like this: cos^-1(cos 2/7) I can do it on the calculator but its not supposed to be worked on the

SOLUTION: I need to know the inverse of cosine of cos 2/7 The problem is written out like this: cos^-1(cos 2/7) I can do it on the calculator but its not supposed to be worked on the

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Question 607371: I need to know the inverse of cosine of cos 2/7
The problem is written out like this:
cos^-1(cos 2/7)
I can do it on the calculator but its not supposed to be worked on the calculator. Help please??
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
cos^-1(cos 2/7)
------------
= 2/7
It's similar to the reciprocal of the reciprocal.
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