Hey guys...very stuck with this question...can anyone help??

(Partial Differentiation)

Find (∂f/∂x), (∂^2f/∂x∂y) , (∂^2f/∂y^2) for the following function

f(x,y) = xsin(-5x - 4y) + ye^(3y)

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- Dec 13th 2009, 07:05 AMCharlieengineer84Partial Differentiation
Hey guys...very stuck with this question...can anyone help??

(Partial Differentiation)

Find (∂f/∂x), (∂^2f/∂x∂y) , (∂^2f/∂y^2) for the following function

f(x,y) = xsin(-5x - 4y) + ye^(3y) - Dec 13th 2009, 07:41 AMHallsofIvy
Okay, l what have you done on this yourself? in particular, what is the derivative of $\displaystyle ye^{3y}$? Do you see how that answers part of your question? If you are expected to be able to do partial derivatives, I assume you know derivatives of basic functions, like sine and exponential, and the product rule.