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Question

Find the orthogonal trajectory of the circle x2+y2−ay=0

A
x2+y2=4cxy
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B
x2+y2=cx
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C
x2y2=cx2
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D
x2+y2=cy
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Solution

The correct option is B x2+y2=cx
x2+y2ay=02x+2ydydx=adydx=02x+2y.dydx=adydx2xdxdy+2y=aNow,x2+y2y(2x.dxdy+24)=0x2+y22xydydx2y2=0x2y2=2xydydxForothogonaltrajectorydydx=dxdyy2x2=2xy.dydxdydx=y2x22xyx2+y2=cxHence,theoptionBisthecorrectanswer.

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