Hello,

How would I evaluate the following:

sin (arc cos (-5/13))

would I put it into the calculator this way:

sin (cos^-1(-5/13)) ????????

-----therefor------

How would I evaluate the following:

sin (arc cos 5/13) <---- noticed there are no parenthesis around the 5/13 like in the first problem. Is this because of the negative? Please help on how I would put them into the calculator? Thanks so very much!

IS IT CORRECT TO GET THE SAME ANSWER FOR BOTH???? 0.923???? ODD WHY IS THIS?