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

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