Find all differentiable functions f: R -> R+ for which the following is true: f'(x) = f(f(x))
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Anonymous2009-10-07 16:57
This one's a bit tricky:
In the parallelogram ABCD, there is a point P on the line AB, and a point Q on the line BC, such that the areas of the triangles formed by APD = 7, PBQ = 28 and QCD = 14.