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" 9) If "y=[log(c)(x+sqrt(a^(2)+x^(2)))]...

" 9) If "y=[log_(c)(x+sqrt(a^(2)+x^(2)))]^(2)" ,prove that "(a^(2)+x^(2))y_(n+2)+(2n+1)xy_(n+1)+n^(2)y_(n)=0

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