Trig Problem

[lewch45]

Can someone help me with this one.....

Find the exact value of sin, cos and tan of (theta/2) given the following info:

sin theta = -9/41

Theta is in Quadrant IV.

Any help would be greatly appreciated. Thanks in advance!!!

 

[royhaas]

In quadrant 4 the cosine will be positive and the angle will be bigger than \(\displaystyle 3\pi/2\). Use the usual identities to determine the rest.