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why does sin have a positive value?

y has a positive value in the top two quadrants

|dw:1329693437661:dw|

so to figure out positive and negative i have to look at 12

so what is u have something like this :

srry i mean

|dw:1329693963427:dw|

now its moving clockwise

why do i have to add 180?

or u can say the angle is -60

|dw:1329694584288:dw|

thats how u show it

cause its moving clockwise

Yes.

so in this question is the 60 degrees going clockwise

so qhen do i know when to add 180 or minus 180

or negative*

can u please give me an example of each type if itsnt too much trouble

|dw:1329695075597:dw|
Is vector M's x component positive or negative? What about its y component?

the x compoinent is negative while the y component is positive

\[v_{x}=|M|\cos(150)=|M|(\frac{-\sqrt{3}}{2})=\frac{-|M|\sqrt{3}}{2}\]

what does 150 degrees tellus ?

are we saying the angle 150 is equal to 30 degrees

so basically we are saying the angle is 150 degrees away from the orgin

From the positive x axis

what about the negative x axis

ohhh i get it

Good :)

and to find the negative value what would i have to do

between 0 and 90 x and y are positive*** sorry

so it doesnt matter whether u say 30 degreees or 150 degrees

thanks . could u please help me with another question

Sorry for the delay on that response

and that has to do withe quadrant whether is positive or negative