Difference between revisions of "1991 AHSME Problems/Problem 18"
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Revision as of 13:53, 5 July 2013
If 
is the set of points 
in the complex plane such that 
is a real number, then is a
(A) right triangle
(B) circle
(C) hyperbola
(D) line
(E) parabola
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions. 
