Tagged Questions
5
votes
1answer
209 views
Wrong Wolfram alpha result?
I have this function
$$
f(x,y) = \left\{
\begin{array}{ll}
\frac{x^3}{x^2 + y^2} & \mbox{if } (x,y) \neq (0,0) \\
0 & \mbox{if } (x,y) = (0,0)
\end{array}
\right.
$$
And I want to ...
2
votes
3answers
408 views
WolframAlpha blows simple substitution?
I am to find a formula for the n-th derivative of $$\frac{1+x}{1-x}$$ I came up with $$\frac{(-1)^{n+1} \times 2 \times n!}{(1-x)^{n+1}}$$
This seems right, but I noticed that WolframAlpha somehow ...
