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What's meant by this?

  1. Dec 3, 2011 #1
    Let y = x^2 + 3x

    and the question is Find [itex]\frac{dy^2}{dx^2}[/itex]

    then how do I understand this token? is it [itex]\frac{d(y^2)}{d(x^2)}[/itex]
    or [itex]\frac{(dy)^2}{(dx)^2}[/itex] = [itex](\frac{dy}{dx})^2[/itex]
    or what ?

    BTW: it's not wrong written, namely, not [itex]\frac{d^2y}{dx^2}[/itex]
  2. jcsd
  3. Dec 3, 2011 #2


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    The notation is unusual. I would guess that you let u=x2 and v=y2, and compute dv/du. Then put x and y back into the result.
    Last edited: Dec 3, 2011
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