of the following statements I. Let f and g be continuous real variable functions defined over the interval I and C the subset of the plane given by C={(x,y): x=f(t),y=g(t); where t ∈ I} then the relation given by C(t)= (f(t) , g(t)) is a function. II. Every curve in the plane can be defined as a function of a real variable. III. The graph of the function r= 4 / (2sinθ+cosθ) corresponds to a straight line.

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