1. The problem statement, all variables and given/known data Prove that sin (a+b) does not equal sin a + sin b. Let a = pi/3 and b = pi/6 2. Relevant equations 3. The attempt at a solution Where im lost is how to figure out what pi/3 or pi/6 is. Like for example, how can I know sin pi/3 is sqrt3 over 2? Is this a case where I have to memorize what they equal to figure it out, or is there a way I can calculate that. Also any kind of reference material to this would be helpful as I need to brush up on this subject. Thank You!