# Math Help - Partial Differentiation

1. ## Partial 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)

2. Originally Posted by Charlieengineer84
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)
Okay, l what have you done on this yourself? in particular, what is the derivative of $ye^{3y}$? 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.