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Let Gamma be a circle with diameter AB a...

Let `Gamma` be a circle with diameter AB and centre O.Let l be the tangent to`Gamma` at B.For each point M on`Gamma` different from A,consider the tangent t at M and let it interest l at P.Draw a line parallel to AB through P intersecting OM at Q.The locus of Q as M varies over `Gamma`is

A

an arc of a circle

B

a parabola

C

an arc of an ellipse

D

a branch of a hyperbola

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