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[" 6.If "cos^(-1)((x^(2)-y^(2))/(x^(2)+y...

[" 6.If "cos^(-1)((x^(2)-y^(2))/(x^(2)+y^(2)))=log" a then "(dy)/(dx)=],[[" (A) "-(x)/(y)," (B) "-(y)/(x)," (C) "(y)/(x)]]

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