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" 21.If "y=x sqrt(a^(2)+x^(2))+a^(2)*log...

" 21.If "y=x sqrt(a^(2)+x^(2))+a^(2)*log(x+sqrt(x^(2)+a^(2)))" then show that "(dy)/(dx)=2sqrt(a^(2)+x^(2))

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