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[" 29.If "u=log(1+x^(2))" and "v=tan^(-1...

[" 29.If "u=log(1+x^(2))" and "v=tan^(-1)x_(" ,then ")(du)/(dv)=],[[" (a) "x," (b) "2x," (c) "1," (d) "2]]

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