Tagged Questions
0
votes
1answer
73 views
Is Wolfram Alpha correct?
Given the attempted derivative at http://www.wolframalpha.com/input/?i=d%28a%28x%29+choose+b%28x%29%29%2Fdx, I believe the result from Wolfram Alpha is off by a factor of 2 or, at least I get a result ...
4
votes
5answers
107 views
Find the second derivative of $e^{x^{3}}+7x$
$$e^{x^{3}}+7x$$
Here is what I have tried so far,
$$y'=(e^{x^{3}})'+(7x)'$$
$$y'=3e^{x^{2}}e^x+7$$
$$y'=3e^{x^{3}+x}+7$$
I am supposed to find the second derivative but I believe I have already made ...
5
votes
1answer
208 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
407 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 ...
0
votes
2answers
396 views
Have I found a bug in Wolfram Alpha's Partial Derivative Solver?
I was using This Wolfram Alpha Page to calculate the partial derivatives of the sum of two gaussians. It believes the answer to be:
$$
e^{-(b-x)^2/2 c^2}
$$
but the working shows it as ending on:
...
