Trig help Wrapping Function

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July 25th 2008, 06:23 PM
pistonsfan22

Trig help Wrapping Function

Okay so I still have no idea how I got this problem wrong on a test. I have the Unit Circle memorized (radians, degrees, and the cosine & sine cordinates)

I know that when you deal with wrapping functions you are really just taking the cosine (x) coordinate on a unit circle and sin (y) coordinate on a unit circle of what ever P( ) which means P of ( ) whatever #.

How is P of (-pi/6) written as P(-pi/6) equal to (-sq root of 3/2,-1/2)

This problem is really just pissing me off. First of all I know that -pi/6 in degrees is 30 and negative 30 degrees is in the IV quadrant so how can the answer be neg sq root of 3/2, -1/2.

On the test I put positive sq root of 3/2, -1/2 and got it wrong.

Help help help!!!

Wrapping functions piss me off!!!
July 25th 2008, 06:34 PM
Chris L T521

Quote:

Originally Posted by pistonsfan22

Okay so I still have no idea how I got this problem wrong on a test. I have the Unit Circle memorized (radians, degrees, and the cosine & sine cordinates)

I know that when you deal with wrapping functions you are really just taking the cosine (x) coordinate on a unit circle and sin (y) coordinate on a unit circle of what ever P( ) which means P of ( ) whatever #.

How is P of (-pi/6) written as P(-pi/6) equal to (-sq root of 3/2,-1/2)

This problem is really just pissing me off. First of all I know that -pi/6 in degrees is 30 and negative 30 degrees is in the IV quadrant so how can the answer be neg sq root of 3/2, -1/2.

On the test I put positive sq root of 3/2, -1/2 and got it wrong.

Help help help!!!

Wrapping functions piss me off!!!

http://img.photobucket.com/albums/v4...5e2143a3-3.jpg

--Chris
July 25th 2008, 06:39 PM
pistonsfan22

oh thanks

Hmmm maybe it was an error by the teacher cause I don't know anyone that got this one right and I'm doing pretty good in the class. Hey is there a certain program you can download to type the symbols in like you did such as pi and all those numbers????
July 25th 2008, 06:44 PM
Chris L T521

Quote:

Originally Posted by pistonsfan22

Hmmm maybe it was an error by the teacher cause I don't know anyone that got this one right and I'm doing pretty good in the class. Hey is there a certain program you can download to type the symbols in like you did such as pi and all those numbers????

We use LaTeX here at the forums, but its currently not working well. In the mean time, were using online converters that convert LaTeX code into pictures. You can find out more about this here, and you can look at LaTeX tutorials here.

--Chris