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.