How to prove du/dv = (-b^(2)v)/(a^(2)u) if u = (-2bt)/(1+t^(2)) and v = a( (1-t^(2))/(1+t^(2)) )

How to prove du/dv = (-b^(2)v)/(a^(2)u) if u = (-2bt)/(1+t^(2)) and v = a( (1-t^(2))/(1+t^(2)) )
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