f is a continuous function on
[0,+∞) and differentiable on (0,+∞), and f is strictly decreasing on (0,+∞)
the question is: is this inequality true for each (a,b) ∈([0,+∞))2 such as $a
(b-a)f(b)\leqslant f(b)-f(a) \leqslant (b-a)f(a)
I've tried to prove that \forall x \in {[}a,b{]} : f(b)\leqslant f'(x)\leqslant f(a) so I can apply the mean value theorem
on {[}a,b{]}
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