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I am struggling

I am quite struggling with these topics:- unit Circle topic.

- how you get the sin, cos & tan of the theta. I don't know how to deal with cos and tan. Like i cant solve this: cos^2(theta)=cos(theta) where 0degrees is greater than or equal to theta and less than or equal to 360. something like that. or this one: 3cos(theta)-1=-2cos(theta)

- ambigious triangle.
- As simple as getting the vertex. I am just weak with getting the vertex.

That's it. I think.
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