1.

निम्नलिखित को ज्ञात करे [ Evalute the following ] : (iii)` int _(0)^(1)x(1-x)^(n) dx `

Answer» माना कि ` I = int _(0)^(1) x (1-x)^(n) dx " "` (1)
x कि जगह `(1-x )` रखने पर हमे मिलता है ,
या ` I = int _(0)^(1) (1-x) x^(n) dx = int _(0)^(1) (x^(n) - x^(n+1) )dx `
` = [ (x^(n+1))/(n+1) - (x^(n+2))/(n+2)] _(0)^(1) = ( 1/(n+1) - 1/(n+2)) - 0`
` = (n+2-n-1)/((n+1)(n+2))=1/((n+1)(n+2))`


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