If \( \int_{0}^{a} x^{m}(a-x)^{n} d x=k \) then \( \int_{0}^{a} x^{n}(a-x)^{m} d x= \) (A) \( k ...

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If \( \int_{0}^{a} x^{m}(a-x)^{n} d x=k \) then \( \int_{0}^{a} x^{n}(a-x)^{m} d x= \)
(A) \( k \)
(B) \( -k \)
(C) \( \frac{k}{2} \)
(D) \( \frac{k}{3} \)
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