- #1
fork
- 23
- 0
If 90 degree < x < 180 degree, which of the following must be positive?
A.sinx+tanx
B.cosx+tanx
C.sinx+cosx
D.sinx-cosx
I don't know how to do this question, what method can I use?
Thanks.
A.sinx+tanx
B.cosx+tanx
C.sinx+cosx
D.sinx-cosx
I don't know how to do this question, what method can I use?
Thanks.