# Tagged Questions

For questions related to usage of Wolfram Alpha.

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### Solve for Y; don't understand Wolfram Alpha's solution

Answering this StackOverflow question, I needed to solve this equation in terms of y: $$x = 6.1 + \log(\frac{{y}}{{0.03p}})$$ Doing it by hand: $$y = 0.03p10^{{(x-6.1)}}$$ Wolfram alpha tells me ...
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### stuck with a cubic equation

I picked an equation $0= x^3 +x^2 -2x -1$ I plotted it with geogebra, to see if it had more than $1$ real root. It definitely cuts the $x$-axis $3$ times. But when I checked wolfram alpha, to see ...
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### Name of special function used by Wolfram integrator

Integrating $e^{-r}/\sqrt{2t-r}$ with respect to $r$ between $r=t$ and $r=2t$ using this widget gives the answer $2e^{-t}F(\sqrt{t})$. However the widget doesn't say what $F$ is. I have looked on ...
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### How do I get wolfram to solve this problem?

I am trying to check some answers and can't seem to get wolfram to work properly. I type in the following command : integrate x.sin(x) dx and it doesn't provide any solution it just says "visual ...
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### Is there any way how I can use Mathematica in Introduction Logic course?

I am very new comer to Wolfram Mathematica software tool and I am interesting is there any way how I can apply this tool for Introductory Logic course. I am participating at the course on 'coursera' ...
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### Why is Wolfram Alpha wrong?

I calculated $$\tan 75^o - [\cot 13^o\cdot \cot 23^o \cdot \tan 31^o \cdot \tan 35^o\cdot \tan41^o]$$ and I got a nonzero answer: http://www.wolframalpha.com/input/?i=tan%2875%29-[cot%2813%29*cot%2823%...
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### Symmetric matrix 10 x 10

Can You give me the example of symmetric matrix 10 x 10. Or if You know online symmetric matrix generator then give me the links. I tried to make this with Wolfram Mathematica but I did not find a ...
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### The curve $(\cos(\sin x),\sin(\cos x))$ as plotted by Wolfram Alpha

I've just gotten this from Wolfram Alpha: It makes no sense to me. $\cos(\sin x)$ is never zero so how can this curve cross the $y$-axis?
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### Computing 2d radially symmetric Fourier transforms (with Wolfram Alpha)

Let's assume that I "know" $\mathcal{F}\{\operatorname{circ}(r)\}(\rho)=\frac{J_1(2\pi\rho)}{\rho}$ $\mathcal{F}\{(1-r^2)\operatorname{circ}(r)\}(\rho)=\frac{J_2(2\pi\rho)}{\pi\rho^2}$ because I ...
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### Wolfram Exponential Fit not match as formulas

I am using WolframAlpha Exponential-Fit formulas to find equation of Exponential Regression http://mathworld.wolfram.com/LeastSquaresFittingExponential.html but after implementation, I tested with a ...
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### Problem with graphing a function.

To my understanding, function $f(x)=\frac{1+x}{1+x^3}$ should not be defined with $x=-1$ since: $f(-1)=\frac{1+(-1)}{1+(-1)^3}=\frac{1+(-1)}{1+(-1)}=\frac{0}{0}$ However, Google's plot drawer and ...
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### Using newthon method to find nth root - did wolframalpha get it wrong?

I'm trying to implement the n-th root algorithm as outlined here: http://en.wikipedia.org/wiki/Nth_root My code however, takes a lot of iterations (more than 100) to converge. I tried to check with ...
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### How does one provide a determinant as input to Wolfram Alpha?

$\begin{vmatrix} 17&-12&4&0\\ 5&9&-2&1\\ 3&-6&-1&14\\ 11&7&0&8\\ \end{vmatrix}$ How would one express the preceding determinant in the Wolfram Alpha™ ...
### Why does WolframAlpha give a strange solution set to $\lfloor a\rfloor=0$?
I decided to go and look up the roots of $\lfloor a\rfloor$ in WolframAlpha where $a$ is any number, real or complex, and of course the interval $[0,1)$ showed up as an answer but I also got these ...