If y³ + x³ -3axy = 0, PT d²y/dx² = -2a³xy/(y²-ax)³

y³+x³=3axy
​diff both the sides,
3y².y1 + 3x²=3ay+3ax.y1
y1(y² - ax) = ay - 3x²
y1= (ay - 3x²)/(y²- ax)
again diff both the sides,
y2= [ (y²-ax). (ay1 - 6x) - (ay - 3x^​2). (2y.y1 - a)]/ (y²-ax)²
Input the value of y1 and you will get your answer

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Take 3axy as 3a(xy)..then apply product rule

If y3 + x3 -3axy = 0, PT d2y/dx2 = -2a3xy/(y2-ax)3

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All answers are wrong.