Question

Name the quadrant cosx< 0

Answer 1

it represents the negative x axis (i.e between 2nd and 3rd quadrant)

Answer 2

Yes but which one? I don't really get quadrants

Answer 3

Recall that every point on our unit circle can be parameterized so its \(x\) and \(y\) coordinates are given by \(\cos\theta\) and \(\sin\theta\), respectively, where \(\theta\) is our central angle, e.g.
Therefore \(\cos\theta<0\) corresponds to \(x<0\) -- i.e. a negative \(x\). Do you know in which quadrants \(x\) values below \(0\) lie?