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Let f be a continuous strictly increasin...

Let f be a continuous strictly increasing function from `[0,oo)` onto `[0, oo)` and `g=f^(-1)` (that is, `f(x)=y` if and only if `g(y)=x)`. Let `a, b>0` and `a!=b`. Then `int_0^a f(x) dx +int_0^bg(y) dy` (A) greater than equal to ab (B) less than ab (C) always equal to ab (D) always equal to `(af(a) +bf(b))/2`

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