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[" 21.If "int(x+sqrt(1+x^(2)))^(n)dx=(1)...

[" 21.If "int(x+sqrt(1+x^(2)))^(n)dx=(1)/(a(n+1)){x+sqrt(1+x^(2))}^(n+1)+(1)/(-b(n-1)){x+sqrt(1+x^(2))}^(n-1)+c],[" Then "(a+b)" is equal to "]

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