Question

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

Answer 1

With respect to which variable?

Answer 2

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

\(\huge \color{green}{\textbf{Welcome To Openstudy..}}\)

Answer 3

thanks.

Answer 4

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

Answer 5

just treat y like a constant and differentiate like normal