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Question

Two rods of lengths 'a' and 'b' slide along coordinate axes such that their ends are concyclic. Locus of the center of the circle is.

A
4(x2+y2)=a2+b2
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B
4(x2+y2)=a2b2
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C
4(x2y2)=a2b2
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D
xy=ab
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Solution

The correct options are
A 4(x2+y2)=a2+b2
C 4(x2y2)=a2b2
Length of the intercept made by the circle on x axis =2g2c
Length of intercept by the circle on y axis=2f2c
a=2g2c
b=2f2c
Let the locus of P(x,y) be
a2±b2=4(g2c)±4(f2c)
=4(x2c)±(f2c)
=4(x2±y2) on simplification

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