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[x=tan((1)/(a)log y)" then "],[(1+x^(2))...

[x=tan((1)/(a)log y)" then "],[(1+x^(2))(d^(2)y)/(dx^(2))+(2x-a)(dy)/(dx)=],[" (a) "0quad (b)1quad (2)-1quad (2)2]

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