Maths problem

dy/dt = d/dt (c/t)

dy/dt = - c/t^2

dx/dt = d/dt (ct)

dx/dt = c

 dy/dt           - c/t^2

---------    =    ---------

 dx/dt                c

dy/dx = -1/t^2

thanks

dy/dx=

d. c/t.1/d.1/ct  = 1/t2

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