Points at which the graphs of r = f(?) and r = g(?) intersect must be determined carefully. Solving f(?) = g(?) identifies some - but perhaps not all - intersection points. The reason is that the curves may pass through the same point for different values of ?. Use analytical methods and a graphing utility to find the intersection points of the given curves for 0 ? ? ? 2?.r = 6 + cos ?, r = 6 - sin ?
A. 
, 
B. 
, 
C. 
, 
D. 
, 
Answer: B
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