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posted by amanda on Thursday, January 12, 2012 at 8:04pm.
If tan theta=-3/4 and 90°<theta<180° Then find cos theta
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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