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Math Help - partial differentiation!

  1. #1
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    partial differentiation!

    if  x=z^2 \arctan(\frac{y}{z}) find \frac{d^2x}{dzdy}

    have attempted the problem above and here is what i got;

     \frac{3z^4+9z^2y^2}{(z^2+y^2)^2}

    pls see to this solution if am in order, thanks.
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  2. #2
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    Crna Gora
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    Re: partial differentiation!

    Shouldn't it be :

    {\frac {{z}^{2} \left( {z}^{2}+3\,{y}^{2} \right) }{ \left( {z}^{2}+{y}^{2} \right) ^{2}}}
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