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 345 rightangled triangle
so y = 3, x = 4, r = 5
cosØ = 4/5
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