Question

What is cos -1 ( -1/2) in quadrant 1 ?

Answer 1

`(2\pi)/(3)`

Explanation:

So here they are asking for one angle that gives you the cosine value is equal to -1/2 while being in quadrant 2.

So you look in quadrant 2 and find x=-1/2 which is at
`(2\pi)/(3)`.

`\cos^(-1)((-1)/(2))=(2\pi)/(3)` while being in quadrant 2.