The locus of a point P which divides the line joining (1, 0) and (2cosθ,2sinθ) internally in the ratio 2:3 for all 0, is a
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a
straight line
b
circle
c
pair of straight lines
d
parabola
answer is B.
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Detailed Solution
Let the coordinates of the point P which divides the line joining (1, 0) and (2cosθ,2sinθ) in the ratio 2 :3 be (h, k). Then, h=4cosθ+35 and k=4sinθ5⇒ cosθ=5h−34 and sinθ=5k4⇒ 5h−342+5k42=1⇒ (5h−3)2+(5k)2=16Hence, the locus of (h, k) is(5x−3)2+(5y)2=16, which is a circle.