Question

Tanx >0
Find in which quadrant x lies in?
How to find?

Answer 1

Tan is positive in the first and third quadrants.

Answer 2

tan = sin\cos so you want them both to be negative or both to be positive
when does this happen?

Answer 3

When they are either in the first or thitd quadrant?

Answer 4

The following conditions need to be stated.
In the first quadrant:
\[0^\circ<x<90^\circ\]
And in the third quadrant:
\[180^\circ<x<270^\circ\]