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[" 7.If "y=(tan^(-1)x)^(2)" then "],[[(x...

[" 7.If "y=(tan^(-1)x)^(2)" then "],[[(x^(2)+1)^(2)(d^(2)y)/(dx^(2))+2x(x^(2)+1)(dy)/(dx)=],[[" (A) "4," (B) "2],[" (C) "1," (D) "0]]]

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