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Exact not evact sorry

2*165º = 330º = 360º - 30º Reference Angle -30º

\[\tan \left( \frac{x}{2} \right) = \frac{\sin x}{1 + \cos x}\]
plug x = 330º

maybe you forgot to rationalize the denominator?

|dw:1357957749155:dw|

how do you do that?

multiply by the conjugate

\[\frac{-1}{2 +\sqrt{3}}\]multiply by \[\frac{2 -\sqrt{3}}{2 - \sqrt{3}}\]

the answer is square root 3 minus 2 in the book. I cannot quite get it to match

Again, let's see your work. We'll be able to tell where you wander off.

|dw:1357958794041:dw|

yes, what is the value of square root of 9?

That's it. Don't panic that it does not yet match the book. Keep going!

continue then

|dw:1357959061747:dw|

yes, you got it

Thank you