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[" 10.If "x=(1-t^(2))/(1+t^(2))" and "y=...

[" 10.If "x=(1-t^(2))/(1+t^(2))" and "y=(2t)/(1+t^(2))," then "(dy)/(dx)=],[[" (a) "(-y)/(x)," (b) "(y)/(x)," (c) "(-x)/(y)," (d) "(x)/(y)]]

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