Posted by Ana on Thursday, June 10, 2010 at 9:58pm.
Is the answer to: cosθ, if tanθ = 1 and 180° < θ < 270° ; (√ 2)/2 ?

Algebra 2  Reiny, Thursday, June 10, 2010 at 11:28pm
close, but remember that in the third quadrant the cosine is negative, so
cosØ = √2/2