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## Homework Statement

Well I have a couple trig questions that are most likely very simple, but I can't really remember the theory behind them. The first is:

sin(pi)/2.

I asked my teacher how to find this and he told me to just remember it was sqrt(2)/2. The thing is, I'd like to understand why this is true. I have been searching the internet and have found some things but I just need a simple explanation of what the sin function actually does.

The other problem is:

1/(1-cos(2*pi). This one I'm really at a loss for how to solve for the same reason as the first one, I just don't understand the math.

## The Attempt at a Solution

I know that sin(pi)/2=sqrt(2)/2, so I have the solution, I would like to understand it though.

The second question, I don't even know where to start, so if anyone could explain the method I could give it a shot. Thanks for your help.