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If y=log (x + sqrt(x^(2) + 1)) then show...

If `y=log (x + sqrt(x^(2) + 1))` then show that, `(x^(2) + 1) (d^(2)y)/(dx^(2)) + x (dy)/(dx)= 0`

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If y= log (x + sqrt(x^(2) + a^(2))) then (dy)/(dx) = ………