Let C be the circle with centre (0, 0) and radius 3 units. The equation of the locus of the midpoints of the chords of the circle C that subtend an angle of 2π3 at its centre is -
A
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B
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C
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D
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Solution
The correct option is B
Let P(x1,y1) be a point on the locus cosπ3=OPOA=√x21+y213=x21+y21=94∴ Equation to the locus is x2+y2=94