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about to only mathematics

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`L(m,n)=int_(0)^(1)t^(m)(1+t)^(n)dx`
`=[(t^(m+1))/(m+1)(1+t)^(n)]_(0)^(1)-int_(0)^(1)n(1+t)^(n-1)(t^(m+1))/(m+1)dx`
`=[(t^(m+1))/(m+1)(1+t^(n))]_(0)^(1)-n/(m+1)int_(0)^(1)t^(m+1)(1+t)^(n-1)dx`
`(2^(n))/(m+1)-n/(m+1)L(m+1,n-1)`
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