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[" Which of the following is/are correct? "],[" (A) "cot^(-1)(x)=tan^(-1)((1)/(x))AA x in R-{0}],[" (B) If "f:R rarr R" such that "f(x)=sgn(e^(x))" then "f(x)" is an into function."],[" (C) If "f:R rarr R" such that "f(x)=sin x+x" then "f(x)" is an odd function."],[" (D) If "f:R rarr R" such that "f(x)=(e^(x))/(e^((x)))" then "f(x)" is a periodic function."],[" (where [.] represents greatest integer function) "]

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