a and B are acute angles in quadrant 1, sin a= 7/25 : cos B =5/13. Without using a calculator determine the values of: Sin(a+B) and tan(a+B).[/size]
Look here.
http://gyazo.com/86a75edbd43609dd8cd27e67f1291d52
You are probably supposed to memorise the first 3.
