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[" 45.If "y=sqrt((1-x)/(1+x))" ,then "(1...

[" 45.If "y=sqrt((1-x)/(1+x))" ,then "(1-x^(2))(dy)/(dx)+y" is equat to "],[[" (a) "1," (b) "-1],[" (c) "2," (d) "0]]

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