Posted by **amanda** on Thursday, January 12, 2012 at 8:04pm.

If tan theta=-3/4 and 90°<theta<180° Then find cos theta

- pre calc -
**Reiny**, Thursday, January 12, 2012 at 8:38pm
So you are told that Ø is in quadrant II, and it looks like you are dealing with the 3-4-5 right-angled triangle

so y = 3, x = -4, r = 5

cosØ = -4/5

## Answer This Question

## Related Questions

- Calculus - I wanted to confirm that I solved these problems correctly (we had to...
- Pre Calc. - Use the sum or difference identity to find the exact value of sin255...
- trigonometry - can you correct the rest for me please? Express each as a ...
- trigonometry - can you correct the rest for me please? Express each as a ...
- trigonomtry - can you correct the rest for me please? Express each as a function...
- Math - angle theta is in the standard position and 0'=<theta=<180'. If cos...
- Maths- complex numbers - Find tan(3 theta) in terms of tan theta Use the formula...
- trig - If sin theta is equal to 5/13 and theta is an angle in quadrant II find ...
- math - I have a question I have been working on since yesterday and I am not ...
- Precalculus check answers help! - 1.) Find an expression equivalent to sec theta...

More Related Questions