InterviewSolution
Saved Bookmarks
| 1. |
Which of the following is not the differential equation of family of curves whose tangent from an angle of `pi/4` with the hyperbola `xy=c^(2)`?A. `(dy)/(dx)=(x-y)/(x+y)`B. `(dy)/(dx) = x/(x-y)`C. `(dy)/(dx) = (x+y)/(y-x)`D. None of these |
|
Answer» Correct Answer - B `xy=C` or `x(dy)/(dx)+y=0` or `(dy)/(dx)=-y/x=m_(1)` By condition, `tanpi/4=|(m_(1)-m_(2))/(1+m_(1)m_(2))|` `1=|(-y/x-m_(2))/(1-y/xm_(2))|` or `y/x+m_(2)=1-y/xm_(2)` or `y/xm_(2)-1` or `(dy)/(dx) = (x-y)/(x+y)` or `(dy)/(dx) = (x+y)/(y-x)` |
|