Given:
and .
To find:
The quadrant.
Solution:
We know that,
In I quadrant, all trigonometric ratios are positive.
In II quadrant, only are positive and others are negative.
In III quadrant, only are positive and others are negative.
In IV quadrant, only are positive and others are negative.
We have,
and .
Here, is positive and is negative. So, lies in the III quadrant.
Therefore, the correct option is C, i.e., III.