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[" 51.Let "f:R rarr R" be such that for all "x in R(2^(1+x)+2^(1-x)),f(x)" and "(3^(x)+3^(-x))" are in A.P.,then the "],[" minimum value of "f(x)" is : "],[[" (1) "2," (2) "3," [JE-MAIN-2020] "],[" (3) "0," (4) "4]]

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