Let be a twice differentiable function such that for all If then is :
decreasing on and increasing on
increasing on
increasing on and decreasing on
decreasing on
twice differentiable
Such that.
If
for to be increasing
Since in increasing
So for
hence
and for
hence increasing
Option 1)
decreasing on and increasing on
Option 2)
increasing on
Option 3)
increasing on and decreasing on
Option 4)
decreasing on
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