[" is continuous at "x=0" ."],[" If "y=(tan^(-1)x)^(2)," show that "(x^(2)+1)^(2)(d^(2)y)/(dx^(2))+2x(x^(2)+1)(dy)/(dx)=2]

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If y = (tan^(-1)x)^(2) then show that (x^(2) + 1)^(2) (d^2 y)/(dx^2) + 2x(x^2 + 1)(dy)/(dx) = 2

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