The polar equation of a circle is given. Give polar coordinates for the center of the circle and identify its radius.r = 4 cos ?
A. C(4, 0), radius = 4
B. C(4, ?/2), radius = 4
C. C(2, 0), radius = 2
D. C(2, ?/2), radius = 2
Answer: C
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A. increasing on 
decreasing on 
B. decreasing on 
increasing on 
C. increasing on 
decreasing on 
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decreasing on 