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[" If "log(x^(2)+y^(2))=2tan^(-1)((y)/(x...

[" If "log(x^(2)+y^(2))=2tan^(-1)((y)/(x))" then "(dy)/(dx)" is equal to "],[[" (a) "(x-y)/(x+y)," (b) "(x+y)/(x-y)," (c) "(2x+y)/(x-y)," (d) "(2x+y)/(x-2y)]]

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