" 28.If "t" is a variable,then what does the curve "x=(a(1-t^(2)))/((1+t^(2))),y=(2bt)/((1+t^(2)))" represent? "

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

If x=a[(1-t^(2))/(1+t^(2))],y=(2bt)/(1+t^(2) then find dy/dx .

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

The locus of the point x=(t^(2)-1)/(t^(2)+1),y=(2t)/(t^(2)+1)

Find the derivatives of the following : x=(1-t^(2))/(1+t^(2)), y=(2t)/(1+t^(2))

The eccentricity of the conic x=3((1-t^(2))/(1+t^(2))) and y=(2t)/(1+t^(2)) is

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

The eccentricity of the conic x=3((1-t^(2))/(1+t^(2))) and y=(2t)/(1+t^(2)) is

If t be a variable parameter, show that the point x = a(1 -t^(2))/(1+t^(2)),y = b(2t)/(1 + t^(2)) always lies on an ellipse .

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