If x = a(1 + t²/1 - t²) and y = 2t/1 - t² Find dy/dx

if x=a(1+t^2/1-t^2) and y=2t/1-t^2 find dy/dx
If x = a(1 + t^2/1 - t^2) and y = 2t/1 - t^2 find dy/dx.
if x = a(1 + t2/ 1 – t2) and y = 2t/(1-t2), find dy/dx
If x = (1 - t2)/(1 + t2) and y = 2t/(1 + t2), then dy/dx =
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