`(dy)/(dx)` ज्ञात कीजिए|
`x=4t, y=(4)/(t)`

Explanation

`x=4t" "y=(4)/(t)`
`(dx)/(dt)=4" "rArr" "(dy)/(dx)=-(4)/(t^(2))`
`therefore" "(dy)/(dx)=(dy//dt)/(dx//dt)=-(4//t^(2))/(4)=-(1)/(t^(2))`