Differentiate once. Plug this into the equation in place of "y'". Differentiate again. Plug this into the equation in place of "y"". Simplify the left-hand side of the equation. Make sure you get "0".
Differentiate once. Plug this into the equation in place of "y'". Differentiate again. Plug this into the equation in place of "y"". Simplify the left-hand side of the equation. Make sure you get "0".
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