SOLUTION: Hi Will someone help please. The d's are like curly d's not sure of the name or how to type? Given f(x,y) = (x - y)/(x + y), evaluate df/dx and df/dy at the point (1,2).

Question 383696: Hi Will someone help please.
The d's are like curly d's not sure of the name or how to type?

Given f(x,y) = (x - y)/(x + y), evaluate df/dx and df/dy at the point (1,2).
Thanks in advance
Answer by tinbar(133) (Show Source): You can put this solution on YOUR website!
the curly d's mean partial derivative. essentially u differentiate your f, first with respect to x, and then to y. by that i mean, when u differentiate with respect to x, treat y as a constant, and then the other way arnd for dy
example: let f(x,y)=x^2 + y^2. then df/dx = 2*x + 0. the y^2 becomes 0 since we treat it as a constant. similarly df/dy = 0+2y.
hope this helps
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