Question 1165264
<font face="Times New Roman" size="+2">


Cotangent is the cosine divided by the sine.


Use the unit circle to obtain the cosine and sine of -120 degrees.  Hint: 120 degrees is *[tex \Large \frac{2\pi}{3}]



*[illustration Unit_Circle.jpg]

																
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
<img src="http://c0rk.blogs.com/gr0undzer0/darwin-fish.jpg">


I > Ø
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
{{n}\choose{r}}
</font>