Prove that _a^b(a+b-x) d x= _a^b f(x) d x and using this find _4^… - Vidyadip

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Prove that $\int_a^b(a+b-x) d x=\int_a^b f(x) d x$ and using this find $\int_4^a \frac{f(x)}{f(x)+f(13-x)} d x$.

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