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[" If the dependent variable "y" is changed to "'z'" by the "],[" substitution "y=tan z" and the differential equation "],[(d^(2)y)/(dx^(2))=1+(2(1+y))/(1+y^(2))((dy)/(dx))^(2)" is changed to "(d^(2)z)/(dx^(2))=cos^(2)z+],[k((ds)/(dx))" ,then the value of "k" equals "]

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