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Question

What is the orthogonal trajectory of x2−y2=c?

A
x2+y2=c
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B
xy=c
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C
y=c
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D
3x2+y2=c
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Solution

The correct option is B xy=c
x2−y2=cForming DE by eliminating arbitary constant2x−2ydydx=0dydx=xySo, DE for orthogonal trajectorydydx=−yxSeparating variables and integratingdyy+dxx=0lny + ln x= kln xy = kEquating arbitary constant k to ln cln xy= ln cxy=c.This is the required orthogonal trajectory.

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