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[" 18.If "y=(x+sqrt(1+x^(2)))^(n)" ,then...

[" 18.If "y=(x+sqrt(1+x^(2)))^(n)" ,then show that "],[(1+x^(2))(d^(2)y)/(dx^(2))+x(dy)/(dx)=n^(2)y" ."]

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