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[" If "alpha" is only real root of the equation "x^(3)+(cos1)x^(2)+(sin1)x+1=0" ,then "(tan^(-1)alpha+tan^(-1)(1)/(alpha))" cannot "],[" be equal to- "],[[" (A) "0," (B) "(pi)/(2)," (C) "-(pi)/(2)," (D) "pi]]

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