Let f(x)=int1^x 3^t/(1+t^2)dt, xgt0, the...

Let `f(x)=int_1^x 3^t/(1+t^2)dt, xgt0`, then (A) for `0 lt alpha lt beta, f(alpha) lt f(beta)` (B) for `0ltalphaltbeta, f(alpha)gtf(beta)` (C) `f(x)+pi/4lttan^-1x, AA xge1` (D) `f(x)+pi/4gttan^-1x, AA xge1`

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