. If \( f \) is an integrable function such that \( f(2 a-x)=f(x) \), then prove that
\[
\int_{0... VIDEO
. If \( f \) is an integrable function such that \( f(2 a-x)=f(x) \), then prove that
\[
\int_{0}^{2 a} f(x) d x=2 \int_{0}^{a} f(x) d x
\]
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