Find the differential equation of all st...

Find the differential equation of all straight lines,
which are at a unit distance from origin.

A

(a) `(y-x "dy"/"dx")^2 = 1-("dy"/"dx")^2`

B

(b) `(y+x"dy"/"dx")^2 = 1+ ("dy"/"dx")^2`

C

(c) `(y-x"dy"/"dx")^2 =1 + ("dy"/"dx")^2`

D

(d) `(y+x"dy"/"dx")^2 =1 - ("dy"/"dx")^2`

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The correct Answer is:

C

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