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Let f:(0,oo)vecR be given by f(x)=int(1/...

Let `f:(0,oo)vecR` be given by `f(x)=int_(1/x)^x(e^(-(t+1/t))dt)/t ,` then (a)`f(x)` is monotonically increasing on `[1,oo)` (b)`f(x)` is monotonically decreasing on `(0,1)` (c)`f(2^x)` is an odd function of `x` on `R` (d) none of these.

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