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[f(x)=tan^(-1)x+tan^(-1)((1)/(x)),g(x)=s...

[f(x)=tan^(-1)x+tan^(-1)((1)/(x)),g(x)=sin^(-1)x+cos^(-1)x" are identical function if "],[" (a) "x in R],[" (b) "x=0],[" (c) "x in[-1,1]],[" (d) "x in(0,1]]

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