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[" 73.If "x=t+(1)/(t),y=t-(1)/(t)," then...

[" 73.If "x=t+(1)/(t),y=t-(1)/(t)," then "(d^(2)y)/(dx^(2))" equals "],[[" (1) "-4t(t^(2)-1)^(-2)],[" (2) "-4t^(3)(t^(2)-1)^(-3)],[" (3) "(t^(2)+1)(t^(2)-1)^(-1)],[" (4) "-4t^(2)(t^(2)-1)^(-2)]]

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