If `x^2+y^2=t-1/t a n dx^4+y^4=t^2+1/(t^2),t h e nx^3y(dy)/(dx)=` 0 (b) 1 (c) `-1` (d) none of these

If x^(2)+y^(2)=t-(1)/(t) and x^(4)+y^(4)=t^(2)+(1)/(t^(2)) then x^(3)y(dy)/(dx)=(a)0(b)1(c)-1(d) non of these

If x^(2) +y^(2) =t-(1)/(t) andx^(4) +y^(4) =t^(2) +(1)/( t^(2)),then (dy)/(dx) =

If x^(2)+y^(2)=t+(1)/(t) and x^(4)+y^(4)=t^(2)+(1)/(t^(2)) then (dy)/(dx)=

if x^(2)+y^(2)=t-(1)/(t) and x^(4)+y^(4)=t^(2)+(1)/(t^(2)) then x^(3)y(dy)/(dx)=?

If x^(2)+y^(2)=(t+(1)/(t)) and x^(4)+y^(4)=t^(2)+(1)/(t^(2)), then x^(3)y(dy)/(dx)=

If y=t^(2)-t+1," then: "(dy)/(dx)=

If x^(2)+y^(2)=t-1/t andx^(4)+y^(4)=t^(2)+(1)/(t^(2)), then prove that (dy)/(dx)=(1)/(x^(3)y).

If x=(1-t^2)/(1+t^2) and y=(2t)/(1+t^2) ,then (dy)/(dx)=