# Math 30 Trig

posted by
**Ray**
.

What is the value of theta if 9 cos^2 theta + 3 cos theta = 0 where 90 degrees < theta < 180 degrees?

posted by
**Ray**
.

What is the value of theta if 9 cos^2 theta + 3 cos theta = 0 where 90 degrees < theta < 180 degrees?