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## Homework Statement

The ratio sin theta =-12/13

## Homework Equations

## The Attempt at a Solution

which comes out to according to my calcuations -0.9230, i then use 2nd sin function on my calculator and come up with -67.3 degrees

this answer is legitimate but another way of writing it would be 180-67.3 degrees

which is 112.7 degrees

180-67.3

=112.7

but the book for some reason shows sin theta = 12/13, it removes the negative on the 12 value when it does the 2nd sin function on calculator(atleast thats what it looks like) why does it do this?

the books answer comes out to be

theta= 180+ 67.3

=247.3

so the plus and minus is what is different about my solution and books. it could be a typo, there have been many in my course book @_@