What do you have so far for the first one?
I previously posted:
Fill in the sines and cosines of this line. Finish this line and you'll know what to do with the extra term.
Basically what I'm asking you to do is the following:
$\displaystyle sin \left ( \frac{\pi}{3} \right )$
and
$\displaystyle cos \left ( \frac{\pi}{3} \right )$
-Dan
You need to simplify
$\displaystyle sin \left ( \frac{\pi}{3} - \alpha \right ) - \frac{1}{2} sin( \alpha )$
I gave you a way to expand out the $\displaystyle sin \left ( \frac{\pi}{3} - \alpha \right )$
When you do so you will see what to do with the sin(a) term.
I think your biggest problem is that you are using a calculator. Put it away. If you work with exact answers you will easily see what to do.
So again I ask you: What are
$\displaystyle sin \left ( \frac{\pi}{3} \right )$
and
$\displaystyle cos \left ( \frac{\pi}{3} \right )$
-Dan