Trig - Quadratic Function Help
Hi, first time poster, long time reader, Here I am as im stuck on some questions for a quiz. Ive looked in notes and books and still cant figure them out...anyway, here they are. Can anyone give me a clue, how I do it...or even the answers...aha..preferably both!
What angles (in radians) in have a cosine of
I know the answer to this is pi/3.
The next question is:
In which quadrant is the other angle whose cosine is
1 / 2
And I know it is Quad 4...
Now...what I dont know is Part C) which is....
Angle not in 1st quadrant:
So how do I find out the angle not in the first quadrant (which is worked out to be Quad 4)?
(I am also stuck on the same question where the angle is pi/6 and need the angle in the 3rd quadrant)