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Proof Using Derivative and Second Derivative

Prove that

if y = x/sqrt(x^2 + 2)

then 3(y^2)(dy/dx) + (x)(d^2y/dx^2) = 0

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Prove that

if y = x/sqrt(x^2 + 2)

then 3(y^2)(dy/dx) + (x)(d^2y/dx^2) = 0

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If y =

Show that 3 y^2 + ...

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