Trig identities): help

[poopy2177]

http://i1166.photobucket.com/albums/q601/jmackdolphin/e7216c39.jpg and I'm supposed to show how one side equals another I would love an explanation too thanks

[Naum]

Add the two fractions up as you would algebraically, simplify and substitute in the trig identity:
http://i44.tinypic.com/ozq5f.jpg

[poopy2177]

ohhh ty! got it