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[*int cos^(-1)((1-tan^(2)x)/(1+tan^(2)x)...

[*int cos^(-1)((1-tan^(2)x)/(1+tan^(2)x))dx=?],[[" (a) "x^(2)+C," (b) "-x^(2)+C," (c) "(1)/(sqrt(1+x^(2)))+C," (d) "(1)/(sqrt(1-x^(2)))+C]]

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