Question

If cos theta =-2/3, which of the following are possible?

Answer 1

do u know about the quadrants ... i mean the first quadrant second quadrant... up to forth quadrant ?

Answer 2

yes. i don't know the specific rules for each quadrant though. im having a rough time with this.

Answer 3

so... to solve this...
first do this simple thing...

Answer 4

if u understand wt i did...
we can write...
tan theta = sqrt(5) / 2
sin theta = sqrt(5) /2

Answer 5

now the problem is to find whether the sin and tan values r positive and negative

Answer 6

so to find that we need to know which quadrant its in right?