Convert the polar equation to rectangular form. Identify the curve.r = cos ?

A. (x + y)2 = y; a circle centered at  with radius 
B. x2 + y2 = y; a circle centered at  with radius 
C. (x + y)2 = x; a circle centered at  with radius 
D. x2 + y2 = x; a circle centered at  with radius 

Answer: D

Mathematics

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