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दिखाएँ कि int(0)^(a) f(x) g (x) dx = 2...

दिखाएँ कि ` int_(0)^(a) f(x) g (x) dx = 2 int _(0)^(a) f(x) dx, ` यदि f तथा g निम्न प्रकार परिभाषित है ।
`f(x) = f(a-x) " तथा " g (x) + g (a-x) =4.0`

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