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[" 5.If "x=tan((1)/(a)log y)" ,then "(1+...

[" 5.If "x=tan((1)/(a)log y)" ,then "(1+x^(2))f''(x)+(2x-a)f''(x)=],[[" A) "1," B)-1"," C)0"," D) none of these."]]

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