Question 376215
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Hi,
Referring to the Unit circle ({{{cos(theta)}}},{{{sin(theta)}}}) or graph of cosine function
One can see that As &#952; increases from &#960; to 3/2&#960;, 
{{{cos(theta)}}}increases from -1 to 0.  Answer a would be the proper selection.
<img src="http://www.math.ucsd.edu/~jarmel/math4c/Unit_Circle_Angles.png">