Partial derivative, is the answer Im giving right?

**Ulysses** · September 20th 2010, 08:18 AM

Well, it looks simple, but I'm not sure If the answer I'm giving is right.

The function is:

$f(x,y)=\sin|y|$
And it asks for the partial derivatives, so:

$\displaystyle\frac{\partial f}{\partial x}=0$

And
$\displaystyle\frac{\partial f}{\partial y}=\begin{Bmatrix}{ \cos|y|}&\mbox{ if }& y>0\\\not{\exists & \mbox{if}& y=0\\-\cos|y| & \mbox{if}& y<0\end{matrix}$

Is this right?

**Ackbeet** · September 20th 2010, 09:47 AM

Looks good to me.

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