WAEC - Mathematics (1998 - No. 4)

Cos x is negative and sin x is negative.Which of the following is true of x?

0^o < x < 90^o

90^o < x <180^o

180^o < x < 270^o

270^o < x <360^o

-90^o < x <90^o

In the 3rd quadrant, only the tan of angles are positive.

The 3rd quadrant = 180° < x < 270°