Unit Circle Help

[vrfulgen]

I'm in a precalculus course in college and I was doing great until we switched to trig.
I have no idea how to start my homework (which is in the link) and it's due in 2 days.
Any helpful hints would be amazing!


http://s1202.photobucket.com/user/v...887474283191_808448016_n_zps1b6ecc87.jpg.html

Thanks!
Tori

 

[pka]

I'm in a precalculus course in college and I was doing great until we switched to trig.
I have no idea how to start my homework (which is in the link) and it's due in 2 days.
Any helpful hints would be amazing!
http://s1202.photobucket.com/user/v...887474283191_808448016_n_zps1b6ecc87.jpg.html

What does $\displaystyle W(\theta)$ mean? How is $\displaystyle W(~)$ defined?

 

[vrfulgen]

I think the "W" can be ignored...

 

[pka]

I think the "W" can be ignored...

That would be absurd. It is the whole point of the question.

 

[stapel]

FYI for any who might have difficulty in viewing the image at the link:

i) Locate $\displaystyle W\left(-\frac{21\pi}{4}\right)$ on the unit circle.

ii) Find the coordinates of $\displaystyle W\left(-\frac{21\pi}{4}\right)$.

iii) Find a number $\displaystyle s$ on $\displaystyle \left[0,\, 2\pi\right]$ such that $\displaystyle W(s)\, =\,W\left(-\frac{21\pi}{4}\right)$.

 

[Luizzmp]

I'm not sure about the first two parts, but for the third one you only need to find a coterminal angle that is in the interval [0,2[FONT=MathJax_Math]π[/FONT]).
You just need to keep on adding 2[FONT=MathJax_Math]π [/FONT]until you get to the specified interval. [FONT=MathJax_Math]2[/FONT][FONT=MathJax_Math]π [/FONT]is the same as 8[FONT=MathJax_Math]π[/FONT]/4 so if you add it 3 times the coterminal angle would be 3[FONT=MathJax_Math]π[/FONT]/4