For the curve \( x y+y^{2}=1, \frac{d^{2} y}{d x^{2}} \) is equal to (A) \( \frac{-y}{x+2 y} \) ...
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0For the curve \( x y+y^{2}=1, \frac{d^{2} y}{d x^{2}} \) is equal to
(A) \( \frac{-y}{x+2 y} \)
(B) \( \frac{2 x y+2 y}{(x+2 y)^{3}} \)
(C) \( \frac{2}{(x+2 y)^{3}} \)
(D) \( \frac{2 x+2 y^{2}}{(x+2 y)^{3}} \)
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