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MathNet 2017-part-05 — 176 problems (EN–VI) Question 65

Math Olympiad Vault · MathNet 2017-part-05 — 176 problems (EN–VI)

Question 65

Let $p$ and $q$ be two positive real numbers, $p \gt q$, and let $C$ be the set of the continuous real functions defined on the interval $[0, 1]$. Find
$$
\max_{f \in C} \int_{0}^{1} \left(x^{p} |f(x)|^{q} - x^{q} |f(x)|^{p}\right) dx
$$
and the functions which yield this maximum.