How can I evaluate partial derivative(x^3+y^2+3*x*y)/partial derivative(x+y)?
I mean with respect to x+y.

Question

across · Answer

With respect to which variable?

anonymous · Answer

I have no clue how to do this but one thing I must say:

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anonymous · Answer

thanks.

mathteacher1729 · Answer

It sounds like you are talking about partial differentiation with respect to non-independent variables here... (maybe?) This document by Arthur Mattuck of MIT might be helpful: PDF http://ocw.mit.edu/courses/mathematics/18-02-multivariable-calculus-fall-2007/readings/non_ind_variable.pdf

zzr0ck3r · Answer

just treat y like a constant and differentiate like normal