- #1
CoolDude420
- 201
- 9
Homework Statement
Find the following limit:
Homework Equations
The Attempt at a Solution
My lecturer has said that rational functions which are a ratio of two polynomials are continuous on R^2. He also said that the limits of continuous functions can be computed by direct substitution.
The function here f(x,y) = x^2+y^2-x^3-xy^2/x^2+y^2 is a rational function(ratio of two polynomials) so it should be continuous on R^2, which means we can compute the limit by direct substitution. But if you try and sub in 0 for x and y, you get 0/0 which means the function is not continuous at (0,0)?
( I know I am meant to factor them and then do it but I don't understand why it isn't working like this straight up if the rules say it should)