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[" If iseseds if Ifm "(1)/(a)int(0)^(oo)...

[" If iseseds if Ifm "(1)/(a)int_(0)^(oo)(x^(2)+ax+1)/(1+x^(4))*tan^(-1)((1)/(x))dx" is equal to "(pi^(2))/(k)],[" where "k in N" equals to "],[[" (a) "4," (b) "8," (c) "16," (d) "32]]

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